A betta will swim in the middle....dwarf gourami............umm......(trying to think of fish that will do well with just one).......tetras will swim in the middle towards the bottom, but they like to be in groups and you have plenty in there already......ok.....a betta or a dwarf gourami, that's all I can think of at present. I am thinking that those danios are going to drive you nuts before too long. I had some of those and am glad I don't have them any longer..they never STOP moving.
Good luck with your orb.....sorry about the food thing...lol....happens....just make sure you get that gravel vac so you can clean that all out or you will have major ammonia and algae problems. Do water changes every day and read the sticky on cycling your tank. It takes more than 2 days to do that and you'll have to keep an eye on the readings for weeks to know when the ammonia spikes and then the nitrites.
All the best !
Good luck with your orb.....sorry about the food thing...lol....happens....just make sure you get that gravel vac so you can clean that all out or you will have major ammonia and algae problems. Do water changes every day and read the sticky on cycling your tank. It takes more than 2 days to do that and you'll have to keep an eye on the readings for weeks to know when the ammonia spikes and then the nitrites.
All the best !
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