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?