Hi! Five of the baby betta girls I got ended up not getting adopted (actually right now it's seven left, but one is spoken for and I hope I can rehome 1 more) so I decided to keep them in a sorority. Thinking of putting them at the LFS just scared me too much, and I have the capacity, so why not.
Anyway, I'm just sharing my plans here for you all to evaluate. Would five giants (3in max) be OK in a 20 gallon? They are small now, so it's not a problem, but I was wondering if this would be sustainable as they grow. As of right now, they are very peaceful and friendly to each other...no agression, it's amazing.
Also, right now I have a 30gal rated cycled HOB filter on there, which I hate (I generally hate hobs of any kind). I am planning on switching to exclusively using a sponge filter, a large one that seems like it could handle the load, but I will be checking it a lot JIC. Can I do this? Or should I keep the HOB and try to improve the baffle? This tank is/will be heavily planted with a variety of rooted and floating plants. There's just too much water movement for my taste, and I really like sponge filters. They seem perfect for bettas. For a while both filters will be running so the sponge filter can cycle.
So, that's my plan, essentially tweaking what I already have. Just want to be sure it's safe for my girls (Zebra, Sunshine, Ghost, Tootsie, and Mabel). This seems to be the best way to go, since I just don't think they would do well alone. Thanks for your help!
EDIT: they are 13 weeks old, about 1.5 inches each (body only)