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?
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.
Also post the filters that you have and want to get.Some have multiple stages of filtration while has literally one.
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.
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
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 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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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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