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Discus and BGK

This is a discussion on Discus and BGK within the Cichlids forums, part of the Freshwater and Tropical Fish category; --> Originally Posted by Bhack91 Yea Im going to have to agree that you shouldn't mix them. When you think about it they aren't compatible ...

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Old 03-16-2010, 07:49 PM   #11
 
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Originally Posted by Bhack91 View Post
Yea Im going to have to agree that you shouldn't mix them. When you think about it they aren't compatible on behaviour level. Although I have never heard a ghostknife requiring a strong current? Even without that in consideration, the nocturnal behavior which I mentioned before would not be good for this dicus. And to add to that they use an electrical organ to navigate, and granted they aren't an electric eel that would probably cause problems as well. I would think the dicus would feel the pulse at night while the knifefish is exploring even if the knifefish doesn't physically come in thier space (stressing them out keeping them awake sort of speak). And between these two reasons I believe the dicus is just too delicate to keep with the ghostknife. I will ask my LFS sources about the current as that is something I havent heard before. My ghostknife does prefer the side of the tank with the filter outlet, so that sparks my curiosity.(I will post this in the correct thread when I find out whatever I may)
To respond earlier I consulted an article in the June 2009 TFH by Dr. Neale Monks on Knifefish in order to refresh my memory as I recalled reading it previously. Dr. Monks is specialized in the fields of marine biology and paleontology. Any of the online resources will obviously say the same thing, I trust Seriously Fish http://www.seriouslyfish.com/profile...bifrons&id=435 but there are others. Will be interested in what store people say. B.
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Old 03-16-2010, 08:26 PM   #12
 
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According to your link discus are listed on compatible fish.
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Old 03-16-2010, 08:52 PM   #13
 
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According to your link discus are listed on compatible fish.
There you are then; I know the fellow who authors that site, Matt, but we can't always agree on everything. I certainly do not recommend it for previously-stated reasons; that site does mention fast streams for knifefish and slow moving streams for discus, so the conclusion from those facts is obvious to me. I may check in with Jack Wattley on this, if anyone knows discus he does. B.

Last edited by Byron; 03-16-2010 at 08:57 PM..
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Old 03-16-2010, 10:00 PM   #14
 
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After reading all that, I do agree that discus and black ghost knifefish should not be kept together. Before, I was only thinking about the fact that bgks are nocturnal, whereas discus are diurnal. Because they are both native to different habitats and bgks can likely disrupt the dicus during their sleep as well as during the day. I guess, now I can keep cardinal tetras :) yay. Although bgks are very cool, I think I will exclude them from this project, however I do plan on keeping them in the future. Looks like I am back to my old stocking list ;)

BTW I was so excited today when my cories spawned again today. They spawned exactly one week ago and I only was able to get two eggs out of the aquarium. Two days ago, they both hatched and now I found 4 more. The ones that hatched are doing good and I think they are getting better at swimming. They seem as though they are wigglers at the moment. The thing that shocked me was that I only have two peppered cories. I thought they were two males but apparently I am wrong. Hopefully if they continue breeding I will be able to raise some fry to adulthood, thus the cories will be happier with a larger population. The female seems to have somewhat of a pouch of eggs on her belly that is constantly refilling with eggs. It is also cool how she holds the eggs between her two fins while it is fertilized and then she places it in the java moss :) Perfect place to put her babies!
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Old 03-17-2010, 04:25 AM   #15
 
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Another thing to consider is the predatory nature of the BGK; should the discus spawn I could see that as being very problematic.
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Old 03-17-2010, 09:31 PM   #16
 
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I was wondering, if I want a low pH and very soft water and I am planning on using a reverse osmosis unit, can I just make the tank water pure RO water or do I have to absolutely add regular tap water. I have heard of cases where 0 hardness can lead to random pH drops and the water needs somewhat of a buffering capacity. Is this true or can I fill my tank with 100% pure water. Also, if I do need to add regular tap water do I have to get the exact measurments of water ratio or can I just do water changes by just adding RO water and then a bit of regular water. EX: I do a 50% water change. I fill up to like 2 inches below the top and then fill the rest with regular tap water?
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Old 03-17-2010, 10:09 PM   #17
 
i give tap water for my discus tank. but our tap water is ok for discus fish...if your tap water parameter is ok then you can easily give it in your aquarium...
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Old 03-18-2010, 11:42 AM   #18
 
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Originally Posted by dylan94 View Post
I was wondering, if I want a low pH and very soft water and I am planning on using a reverse osmosis unit, can I just make the tank water pure RO water or do I have to absolutely add regular tap water. I have heard of cases where 0 hardness can lead to random pH drops and the water needs somewhat of a buffering capacity. Is this true or can I fill my tank with 100% pure water. Also, if I do need to add regular tap water do I have to get the exact measurments of water ratio or can I just do water changes by just adding RO water and then a bit of regular water. EX: I do a 50% water change. I fill up to like 2 inches below the top and then fill the rest with regular tap water?
I would suggest that this depends upon the fish you have in the tank, both what they are (the species) and if they are wild-caught or tank-raised commercially.

With no carbonate hardness to buffer the pH, the pH in an established aquarium will lower fairly quickly after the initial "settling in" period. My tap water is <1 dKH and <1 dGH, and the pH is 7.0 [they put soda ash in the water to keep the pH at 7, it is around 5-6 naturally]. My 70g and 90g aquaria have no buffering agents added, just straight tap water. The hardness is zero (GH and KH) and the pH is 5 or perhaps lower, my test kit only goes to 5. When I do the 50% pwc every week, the pH rises slightly, but not above 6; the lowest test kit I can find indicates 5 as the lowest colour, then 6 with nothing between, and the water is never at 6 so I can only assume it remains close to 5. These tanks have mostly wild-caught fish from Amazonia in the 90g and SE Asia in the 70g; they are vibrant, active, always spawning, so I must conclude they are happy and healthy.

In my 115g I have half a cup of dolomite in the filter; the hardness is steady (for months, even years) at 1-2 dGH, and pH is 6.0 to 6.4 with the usual diurnal variation that occurs in planted aquaria. I have a mix of wild-caught and tank-raised fish from Amazonia in this tank. Spawning is regular among most all the species.

All of the fish I have come from very soft acidic waters. We know that in their native habitat the hardness is so low is cannot be measured, or at the very most may be somewhere between 0 and 1 d, identical to my tap water. The pH of many of these waters varies from 3.5 to 5.5 depending upon the locality. I am speaking of the specific habitats of the species I maintain; there are streams in SA with harder and slightly basic water, but I always thoroughly research the habitats of any fish I intend to acquire so I know I can provide exactly what they require, and those in my aquaria are suited to my water parameters.

Fish and plants require minerals. Fish food provides some of these to fish, and the resulting waste provides some to the plants. We also use liquid fertilizer, root fertilizer, and sometimes enriched substrates, all of which add minerals for the plants. If you have hard or relatively hard tap water, mixing some in with the RO water for the initial filling of the tank can do no harm, and probably would benefit. Monitoring the pH weekly would indicate any lowering as would be bound to occur over a few weeks with a very low hardness, and then replacement water (during the weekly pwc) could be mixed to maintain a stable level, such as I have in my 115g. This avoids any sudden shifts, which is the danger; once a tank is biologically established and mature, it has a tendancy to remain stable even with the influx of water with a not too significant higher degree of hardness and pH. I would base this on the fish and their source.

Byron.

Last edited by Byron; 03-18-2010 at 12:05 PM..
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Old 03-18-2010, 04:47 PM   #19
 
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BGKs all have different temperaments, some will get along with small tetras, and some will kill anything you have in the tank with them. I would say that as long as the BGK you get is small, it will get along with large discus. But not small discus. My BGKs got along with the small school of tetras I had in my tank for about 8 months, until I forgot to feed them too long... Then there were no more tetras. BGKs will eat the eyes out of any fish that annoys them too much and is too big to swallow whole. You will probably never see your BGK's mouth fully open unless they get really ticked off. They can easily swallow a tetra and more whole. So you could divide the tank to see how the BGK acts for a while, then if it's OK remove the divider. Unless you want the focus to be on the discus, in that case you should only get the discus.
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Old 03-18-2010, 06:07 PM   #20
 
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I dont think I will include bgks in my tank anymore, but thanks for trying to help Freddy :)

As for the pH and stuff. I know I am planning on keeping only soft acidic water loving fish. Therfore I will probably add like a gallon of tap water for every 50 gallons of RO water. Does this sound too low. I plan on letting the tank settle in for about a month without any fish, closely monitoring the pH and hardness just to make sure it is stable.

I wanted to mainly stick with fish that occur in the wild with discus. Does anybody (Byron) know which tributaries or rivers discus are usually found in, in Amazonia. Also, which other fish such as tetras and catfish and dwarf cichlids are usually found in the same rivers? I want to include gb rams and neon tetras anyways, but there might be some nice tetra and nice dwarf cichlid that I can choose instead that discus would normally live with in the wild.
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