I donít have any plant advice right now but I saw that you have two comet goldfish with a betta in a three gallon tank. I feel this is a lot and they arenít good tank mates. Goldfish also need more room to move around. The amount of waste produced would require a weekly WC
. This is an acceptable size for a betta to live by itself but not to thrive in. You could do weekly WC
but it would stress out your betta but if you donít do it weekly the fish could get ammonia poisoning. Another thing is goldfish are fin nippers, a bettas worst nightmare. Ghost shrimp would do great in your tank as I know you already have them. But in all itís a bad idea for the betta and goldfish. Correct me if Iím wrong on anything.