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Harlaquin Rasbora Hiding Behind Filter

This is a discussion on Harlaquin Rasbora Hiding Behind Filter within the Cyprinids and Atherinids forums, part of the Freshwater and Tropical Fish category; --> Originally Posted by Reece Ok... Thank you so much for the advice. I will be able to get the extra fish this Wednesday! I ...

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Harlaquin Rasbora Hiding Behind Filter
Old 08-13-2011, 06:58 PM   #11
 
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Originally Posted by Reece View Post
Ok... Thank you so much for the advice. I will be able to get the extra fish this Wednesday! I will keep you posted on how re fish respond and wether it is positive. As for the original part of this, I think that he is hiding behind the filter to get away from the others, that is all I can seem to think of! Hopefully they will accept the new fish in, I will also try my hardest to get a female zebra Danio and not male, just so that the 2 females aren't overpowered by the males...

One more thing, is it ok to do a half-tank water change every week, as I personally think that the more water you change the better (max being half), is there anything wrong with doing half every week?
For the fish being able to get away from the others do you have any decorations, plants live or fake in the tank that create hiding spots for them? Live plants wil actually help in filtering the water, if interested in learning more there is a four part series in the plants section at the top. As for trying to get a female on the zebra danio that would be good would help to spread out possible issues during spawning.

For water changes 40-50% would be fine, and with having the tank as stocked as it is will help to remove waste and also pheromones that the fish will produce. There was a thread on this a couple of weeks ago talking about water changes. If I come across it I will post the link to it.
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Old 08-13-2011, 07:11 PM   #12
 
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Yes I've created a hiding spot in the tank usig artificial plants but it is quite often occupied by other fish
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Old 08-14-2011, 01:41 PM   #13
 
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As this is a 10g, I would strongly suggest removing the danio. More rasbora are advisable instead. Rasbora are quieter and better suited to smaller spaces. The danio being active as Barb mentioned is always going to be frustrated in a 10g and this can cause trouble, either aggression or poor health, or both. Stores will sometimes exchange fish, so if you can get 3 more Rasbora in place of the danio, great.

And yes, a 40-50% water change every week is advisable. In a much larger space you could get by with less volume, but a 10g is not large and these fish are not really "small."

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Old 08-14-2011, 01:49 PM   #14
 
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Ok then. I will try to get the store to exchane the Danios for me... Thanks!
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Old 08-18-2011, 03:06 PM   #15
 
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This will sound extremely strange but just read! Haha.

I went to the pet shop today and told them all about the problem and certain advice I had been given (from you guys) and he said something that shocked me. I was told that they had had this same problem of danios being aggressive before, and also the Rasboras hiding behind the filter. They said that although it is arguable (which you will probably do as soon as you see this!) the best thing to do in my situation is to ignore the stocking rule and get more fish. (they ignore the stocking rule as some of the tanks on display (with fish in for sale) are actually overstocked and have had fish in them for years that are very happy). They recommended getting a seprae tetra so I bought four of them (which are very pretty I must say lol). When I returned home with my four new additions I did the process of putting them in and watched them for quite a while to see what would happen. Take a note that before I pit them in the harlequin Rasbora was behind the filter and the zebra Danio was being aggressive again! So, after 15 minutes of being in the tank the tetras had decided where in the tank they want to stay (which is in the corner behind the artificial plants) and occasionally all come out in their schoal to see whats what in the rest of the tank. As I had been watching them for a while, I figured that I would watch the other fish, the harlequin was out from the filter and the zebra wasn't aggressive. As it was only once I figured that I'd leave it for an hour and check back, instead I checked every 15 minutes haha. The strange thing was, every time I looked there wasn't any aggression from the zebra and the harlequin wasn't hiding. I had been checking for a good three hours and then realised that something good must have happened. I was confused at first at why this had happened and so I rang the fish store and told them the good news and said how has this happened? He said that it's because they sometimes just want more fish in the tank and get stressed if there's not enough, even if you don't add more from their specific type they'll still be satisfied with the extra company.

So that's my day, and a problem solved haha. I will report in the morning how the fish have behaved (the tank is in my bedroom).
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Old 08-18-2011, 03:15 PM   #16
 
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The guy at the fish store said that the zebra Danio would calm down because the seprae tetra is bigger, and so one of those will turn into the boss of the tank an will calm down the zebra, and if it showed it's aggression the seprae tetra would approach it, have a little stare off and then it would go quiet again. I haven't seen that so far though... I believe that the new tank leader is the larger male seprae tetra, who is about .2" larger than the other second largest tetra. I've called him Dave ha.

As for the harlequin Rasbora not hiding anymore he doesn't know, it just seems to happen
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Old 08-18-2011, 04:20 PM   #17
 
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There is truth in that, although unfortunately i believe you are headed for a worse problem.

First on the true part, more fish will settle almost any fish. With dwarf cichlids it is referred to as "dither fish," having some tetra or pencilfish in a tank with a pair of dwarf cichlid will make them much more relaxed and out and about. That is just an obvious example, but the principle usually applies to other fish.

The problem is the fish you got, and the tank size. Serpae Tetra are notorious fin nippers, and can get quite mean in small groups (less than 8-12) and in small tanks. Please read our profile, click the shaded name.

A 10g is far too small for danio (any species) and Serpae Tetra. Both of these will be aggressive in time. You don't have to believe me, obviously you aren't. I can cite you scientific studies on this, but I am not going to bother.

Last edited by Byron; 08-18-2011 at 04:24 PM..
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Old 08-18-2011, 04:47 PM   #18
 
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Please don't think I don't believe you, it is more of a case that I'm a person who has to see it to believe it... Only time will tell, I will report to you whenever I see anything that resembles any aggression or in the worst case fin nipping. If that doesn't happen within a week I will write back, I imagine that something like that will take more than a week, so I will do regular write ups in the coming weeks about any erratic behaviour that I witness. Like I said before thank you for your help!
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Old 08-18-2011, 05:27 PM   #19
 
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Please don't think I don't believe you, it is more of a case that I'm a person who has to see it to believe it... Only time will tell, I will report to you whenever I see anything that resembles any aggression or in the worst case fin nipping. If that doesn't happen within a week I will write back, I imagine that something like that will take more than a week, so I will do regular write ups in the coming weeks about any erratic behaviour that I witness. Like I said before thank you for your help!
I prefer to follow the wisdom of biologists who do know, rather than risk my fish. The fish deserve nothing less. This is why I am so adamant on these issues.

Behaviours can manifest themselves now, or later, but also in different ways that you would not likely even notice. Fish secrete chemicals called pheromones into the water, and other fish can "read" them. This is why we advocate regular water changes; there is absolutely no way to deal with these pheromones and other substances I like to term "crud" since filters cannot alter them, only removing the water. The more fish you have in a given space, the more pheromones are being released. And aggressive fish send out a signal, "I am a bully," and the subordinate fish read that.

Try to imagine how a cat would feel trapped in a room with a very vicious dog chained to one corner. The dog cannot physically get the cat, but the cat is clearly able to read the dog that it would tear it to shreds if it could. The cat is existing in sheer terror, unable to escape and not knowing when the dog may attack. This is exactly what happens in a fish tank. And the closed system means there is no escape. In nature, the weaker fish can escape by swimming away; but not in your aquarium. It is forced to endure whatever comes along.

Sometimes this manifests itself in less colour, or not feeding properly, or acting "odd". Sometimes there is hardly any visible sign of it. But the fish recognizes it nonetheless, and the stress is weakening the fish's immune system. This means the fish will be less healthy, prone to disease that it would otherwise fight off, and almost always a premature death.

And it is true that individual fish exhibit their inherent traits and behaviours to varying degrees. Science is not sure why. But it is certain of those traits in various species. So it is wise to follow that advice. For the good of your fish, which I assume does matter.

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