I have a sump that the tank drains into by means of a riser tube (covered with netting) that's seated in a flange going through the bottom glass of the tank. I drilled a 1" hole in the bottom of the tank to install the flange. The return is pumped back in the to the tank via another flange also installed in the bottom that has tubing coming out at the top of the waterfall. (that tubing is hidden)
The sump was necessary for me because I'm running multiple tanks with it and it makes things maintenance free. Probably not the typical setup though.
I was using a submersible filter before and I found that the water chemistry wasn't steady.
I have a mating pair of kribensis in there. I also have 2 chinese algae eaters but that's more for function than show.
Beta's would be another fish to consider. I've done that before.
The smaller the water area the faster it will foul. Now that the sump is incorporated into the setup I have a lot more water even if it's not always directly in the tank. That makes the water chemistry more stable. Like Rainfrog mentioned the fish have to match with the amphibian's environment.
This tank is super planted also.
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