Many people decide that changing the water in the aquarium every few weeks is more than enough, but the fact is that build ups can happen pretty quickly, so a filter is always a good thing to have, plus it means having to change less water and do so less often. When it comes down to it, we would without a doubt recommend that you get a good water filtration unit for your betta fish tank.
Betta Fish Series - Types of Betta Fish | The Aquarium Guide
I have 3 female bettas that share a tank with one African dwarf frog, 2 guppies, 3 platys, one cory cat, and one temporary comet (had a problem with neighborhood cats and our pond). My aquarium is a 36 gallon bow front that is moderately planted. My biggest betta has been very territorial when I add any new fish to the tank. After she establishes her dominance though (usually only takes a few days), she does not bother the other fish in the tank. My smallest betta hangs out with my dwarf frog under the same plant every day. My last betta swims around with my platys mainly. In my experience they are great community fish.
Betta Fish Tanks Tank Aquariums - Hayneedle
I have an 80 litre aquarium and a red Betta who loves to snake about in the vines. He lives with 4 glass shrimp, 2 large Angels and a small shoal of tetra. There are also 4 zebra cory. He seems happy and doesn’t fight. I have a pond style filter,heater and air pump. They are very graceful fish. I rescued him from living in a stupid cup. It looked like Harry Potter living in a cupboard and I felt sorry for him. He’s a cutey and seems oddly smarter than my other fish. I’ve bought another 55 litre tank so I can get another, I’m smitten.
Most Beautiful Betta Fish for Aquarium Tank - YouTube