wow almost like 2 year reply lmao hahaha honestly i listened to the people at the pet stores and all my ADF's passed away, i then did my own research i then cycled my tank once again with a filter added some beneficial bacteria i actually got phytoplankton to grown in my tank, once my tank was cycled i took out the filter. These frogs are really sensitive and yes people may say the frogs survive in the tank with a filter but with out a filter is when they are more happy. my frogs actually sing and mate with each other and I have only 3 frogs, two females and 1 male. I don't feed them once a day which the pet store tells you to do, that will cause bloating and if not they will be over weight unless you control the eating... but I did a little research and talk to professionals about these frogs and if you feed them once every 4 days they will feel as if they are at home. In the wild these creatures do not eat every day, and they can survive with out food for about 2 weeks. So if i have to say with my experience with the creatures and filters i would probably never use a filter with these creatures every again... instead maybe put a few snails to help clean. And no algae eaters they attack your frogs like they did to mine and kill them. They go after the slim coat on the ADF.

People will argue that you need a filter but you know what it'll take a Little more work to clean the tank more often but you'll have happy frogs at the end of the day. When i tell them they are mating they dont believe it. I had to record it to show them at the pet store. So replicating the actually place they live will bring better results, Like everything else.

Hope this helps.