Originally Posted by
Jenste
IF this is an albino Adf, but I do not believe it tfrog, then a sponge filter should be adequate if cycled beforehand for a small colony of Adf, no more than 6 or so. ADF are very sensitive to water conditions and are best added only to a tank with a fully cycled filter otherwise the filter takes weeks to build the bacteria colony which is actually what filters the water. Uncycled is pretty much just moving water around and making bubbles lol
I still believe that you are bring shown pictures of very young Acf and in that case a spongefilter would be insufficient (an integral designed for a 20 gallon would be better) and you could have no more than two but preferably one frog.