Who Gives A Fish Forums

Exactly. Flow is key. I'd also recommend adding a bit of fish food to the tank to keep the bacteria fed while the new filter establishes. Just don't overdo it, or you'll get an algae bloom.

Agreed with timber. I've done this with my 40-gallon and it worked like a charm. Also, if you have any floating plants, they'll help absorb excess nutrients during the transition. What's your current stocking like?

I've had a similar experience with my own betta pair. When I initially introduced the female to the male for breeding purposes, she actually participated in creating the bubble nest alongside him. However, I've noticed that she doesn't attempt to make nests when she's alone. From my understanding ...