Re: filter for betta?
I have had a betta in a hex shaped tank with an underground filter and he loved it. I've also had success with the small Whisper internal filter. My last betta was housed in the Eclipse 3 aquarium that has a small biowheel. My betta wasn't bothered at all by the water motion in any of these setups.
Jude in Oregon
40 gal breeder: 4 tiger barbs, 6 black ruby barbs, 2 aurelius barbs, red tail shark, clown loach, 4 cories, rubber nosed pleco, and a sailfin pleco (Rumsfeld)
29 gal: 6 rosy barbs (some home grown), 4 cherry barbs, 2 new dwarf neon rainbows, red tail shark, 7 cories, and a sailfin pleco (Karl- after Karl Rove), 2 otos
Eclipse 3: Clifford The Big Red Fish (betta)