I think I found the solution. I bought a battery driven graval cleaner- and modified it with a long hose to drain the water and poop directly in to the toilet, so will be changing their water with 10% daily. About ammonia- when I started the tank I got a water sample cheked at my pet store (well they only have fish, frogs and turtles) every day for 2 month, they say the water chemistry is great so now I get it checked once a week. But now I will change my routines, so will chek the chemistry every day for 2 month. But would still love get a filter, that could run 24 hours when I upgrade to my 24 gallon, so I can cut back on the water changes a bit, but only if I can find a quiet one with low suction and outlet so the frogs can thrive in it. I would live it to be one that goes inside the tank, since I live in a small flatt, but money is not a problem, just want the best filter when I upgrade.