I've used Whisper 'Internal' filters with these frogs. The entire filter is submerged in the water, I would imagine the mechanics of the filter being under water would make them kind of noisy. Vibration and sound carries four times faster under water, I believe.
Quite often my frogs would sandwich themselves behind them to rest. If they were so harmful to frogs, why would they do that?
Now that I use a canister I usually adjust my spray bar a lot. Some times I keep it spraying against the glass and some times I let it circulate water the way it's supposed to. I'm still undecided on which is the best method, I think for water quality and my plants health circulating the water is best but the frogs -seem- a bit more lively in more stagnant conditions. What I mean by this is in my tank they have the option of retreating to an area in the back of the tank to a wild mess of plants where the is little to no current.
I notice when I flow the water against the side of the tank I wind up with spring tails on the surface of my water and planaria 'problems' (used to have water fleas, they seem to have disappeared).
I usually go 50/50 on this, I like to keep the water 'stagnant' some times so the frogs come out and swim around a bit more. They do either way but when the spray bar circulates the water they just seem to hide more often.
Either way I do a lot of water changes and my NO3 (nitrate) usually measures ~5ppm, regardless.
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