Chiming in, what decor are you using ? Did you ditch any seashells ?
That tentacle looking ornament has a bad reputation for becoming sticky and either poisoning or polluting tanks. I'd remove it if you still have it ASAP.
Many Betta keepers on FB have accounts of that ornament being an issue.
Once your 65 is cycled I would add to your Glo Tetra group. Skirt Tetras are a little nippy, not as bad as Tiger Barbs, but can be bratty. So a large group will keep more fins intact.
I like Harlequin Rasboras or Cherry Barbs. Mine have been very hardy.
Cories are a favorite if you use a soft sand substrate.
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Thanks for the heads up on the decoration. I do still have it in the tank, but I will remove it. I am
Planning on getting a new decoration (Easter Island statues) for the new tank, but I want to use some of the gravel and fake plants from my 10 gallon. I want this tank to be full of fish not "stuff"!
I was considering other Tetras, including skirt. I really like Tiger barbs, but I don't want them bullying my Tetras. I'm also on the fence about danios. I think they would be peaceful with my Tetras, but I hear they're pretty hyper. Thoughts?