I'd say the 106gph should be fine. The betta will appreciate a softer flow and it will still turn your tank over 5 times every hour. I like to have my in- and outflow on opposite sides of the tank, but that's just my preference. Some put them side by side. Bettas or CPDs don't need warm water, so a heater may not be necessary. Also warmer water holds less O2 for the fish, fwiw. If you notice dead zones (I'm thinking you won't) a small power head can be put in the back out of sight. As for spin or lilly pipe types, I'll let someone else share their experiences, I don't have much on thoseI'm looking at doing a SE Asia themed tank with a betta and galaxy rasboras, so I want to keep the flow down or diffuse, but I don't want dead zones. I've been looking at 2 different canister filters (one is 106 gph and the other is 265 gph) and spin pipes to address this issue. My question is, what combination of gph, lilly pipe types, and inflow/outflow placement do you think will work best for my situation?
Thanks in advance
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