Originally Posted by JayPe3
Thanks Ghost, that's really interesting.
What's the issue with water current in the Betta tank?
My aquaclear is adjustable, and it still creates a current, but it's nothing crazy.
Bettas generally don't like much current in their water, especially the heavier finned boys. Wild B. splendens come from rice paddies and similar places that have little to no water movement, so they aren't accustomed to swimming in fast-moving water, and selective breeding has only augmented this issue by creating fish with larger, heavier fins. They're also often bred in small spaces with no water movement, so they don't typically have the muscles built up to be able to swim in moving water; this can be delt with to some extent as they can gradually build up the muscles needed, but there's still a limit to how strong they can get.