Help choosing filter for a 20-gal tank
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Help choosing filter for a 20-gal tank

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Help choosing filter for a 20-gal tank
Old 02-04-2014, 02:53 PM   #1
 
Question Help choosing filter for a 20-gal tank

Now that my new 20-gal tank seems to be cycling, I am starting to make plans for adding fish and plants over the next few months.

Based on one hypothetical configuration with 5 Zebra Danios, 5 Cardinal Tetras, and 3 Sterba's Corys, AqAdvisor (AqAdvisor - Intelligent Freshwater Tropical Fish Aquarium Stocking Calculator and Aquarium Tank/Filter Advisor) is telling me that my 100GPH H.O.B. filter would be inadequate. They say I would have only 79% of the capacity needed. (They also say I should have a minimum of 4 Corys). So that suggests I need 125GPH or more.

The same recommendation is associated with similar hypothetical stock, e.g. 6 Zebra Danios, 4 Sterba's Corys, 2 Dwarf Gouramis.

The site does consider these combinations to be acceptable stocking levels for a 20-gal tank; it just seems that they recommend more filtration.

Question 1: Do you agree that an upgrade is advisable?

Question 2: If I do upgrade, I can consider other sorts of filters. What would you recommend? A bigger H.O.B. power filter? A canister? Any favorites, and why?

Question 3: Based on the recommended filter type, what is the ideal way to transition without inducing another large cycle?
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Old 02-05-2014, 02:51 PM   #2
 
1: Yes,either upgrade the filter or hang back on the fish.
2:A canister filter is my recommendation since you can add on to it more easily and you can hide it better.They also tend to be of a higher quality then HOB filters,but at the same time more expensive. In the long run,save your old filter and upgrade to a 125~150 gph canister. Better to have more filtration then less but you will have more flow.
3:Honestly,I'm not totally sure.Hopefully someone else with more knowledge than me can answer.
Good luck and I hope I helped.
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Diver Down (02-05-2014)
Old 02-05-2014, 03:04 PM   #3
 
Also post the filters that you have and want to get.Some have multiple stages of filtration while has literally one.
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Old 02-05-2014, 03:12 PM   #4
 
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Quote:
Based on one hypothetical configuration with 5 Zebra Danios, 5 Cardinal Tetras, and 3 Sterba's Corys, AqAdvisor (AqAdvisor - Intelligent Freshwater Tropical Fish Aquarium Stocking Calculator and Aquarium Tank/Filter Advisor) is telling me that my 100GPH H.O.B. filter would be inadequate. They say I would have only 79% of the capacity needed. (They also say I should have a minimum of 4 Corys). So that suggests I need 125GPH or more.
You need 6+ Corys to keep them happy. They are shoaling fish and need their own kind. Is this a 20 high or 20 long?

Quote:
The same recommendation is associated with similar hypothetical stock, e.g. 6 Zebra Danios, 4 Sterba's Corys, 2 Dwarf Gouramis.
2 dwarf gouramis won't do well together. I'd stick with one and not a DG but a smaller species such as a honey.

Quote:
Question 1: Do you agree that an upgrade is advisable?
Depends on whether we are talking about a high or long tank. Definitely can't keep two DGs in there, though.

Quote:
Question 2: If I do upgrade, I can consider other sorts of filters. What would you recommend? A bigger H.O.B. power filter? A canister? Any favorites, and why?
Canister is always the way to go. Provides much better filtration due to a larger amount of media it can hold. For the 20 gallon, I'd suggest
this this
filter.

Quote:
Question 3: Based on the recommended filter type, what is the ideal way to transition without inducing another large cycle?
Run both filter simultaneously for at least a month and you should be safe to remove your current filter.
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Old 02-05-2014, 03:30 PM   #5
 
You CAN keep 2 DG if you bought them from the same tank and kept them together.Still,better idea is just go with one.
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Old 02-05-2014, 04:23 PM   #6
 
Thanks Sev. I'll post the candidate filters after I have done some research. In the meantime, I'd be happy to hear about member experiences... good and bad.

Flint... the tank is a 20-high. The length and width measure about 24x12 (and 16 hight). Is there enough surface area on the bottom for six Corys
?
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Old 02-05-2014, 05:54 PM   #7
 
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It's POSSIBLE to keep two DGs together, but buying them at the same time assures nothing.

If you want cories, I'd suggest looking into the following species -

Corydoras habrosus - Salt and Pepper Cory
Corydoras pygmaeus - Pygmy Cory
Corydoras hastatus - Dwarf Cory

I'd suggest following stocking with them -

1 Honey Gourami
8 Cory
8 Zebra Danio
8 Cardinal Tetra

What filter are you running currently? You could run your current HOB as long as you make sure to check your parameters three or four times a week after you get the fish to make sure it can handle the bioload. I don't see it being a big deal but I always run 6-8x my tank volume an hour. I like to overfliter, though.
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Old 02-05-2014, 07:56 PM   #8
 
Quote:
Originally Posted by Flint View Post
It's POSSIBLE to keep two DGs together, but buying them at the same time assures nothing.

If you want cories, I'd suggest looking into the following species -

Corydoras habrosus - Salt and Pepper Cory
Corydoras pygmaeus - Pygmy Cory
Corydoras hastatus - Dwarf Cory

I'd suggest following stocking with them -

1 Honey Gourami
8 Cory
8 Zebra Danio
8 Cardinal Tetra

What filter are you running currently? You could run your current HOB as long as you make sure to check your parameters three or four times a week after you get the fish to make sure it can handle the bioload. I don't see it being a big deal but I always run 6-8x my tank volume an hour. I like to overfliter, though.
Thanks Flint. I'm running a 100GPH hang-on-back power filter from Aqueon. It came with a "starter kit." It's very quiet, and it occupies very little volume inside and outside the tank. Seems to do the job at the moment, but also seems to have some limitations. For example, when I wanted to add Nitra-Zorb, I couldn't fit the pouch inside the chamber without causing the intake to divert around the cartridge. Also, as far as I know, there is only one type of replacement cartridge made for it. More importantly, it seems a bit undersized. Even when using the one inch of fish per gallon rule of thumb on stocking, sources have indicated 125GPH would be needed in this tank.
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Old 02-06-2014, 07:02 AM   #9
 
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The inch-per-gallon and aqadvisor are both flawed. If you are concerned about your filtration, there is a 265 gph sunsun (it has a spraybar, so you can control the flow) or you could go for a 30 or 50 gallon AquaClear.
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