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Try and also get a cheap 5-10 gallon tank, sponge filter is enough for betta.I tried telling him that but he insisted on getting a fish so he went to a fish store and got a betta without me knowing until after he got it. I'm working on finding a small filter for his tank.
No biggieThank you. I will try that.
I agreeIf he can still see the decorations, then leave them in. If his eyes get worse, then you can follow the directions I posted above. I hope you can convince your brother to get a bigger tank. Your betta will definitely appreciate it. Also, the filter is important, but make sure the flow isn't too strong, especially since the betta can't see well.