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I woul up your schools of tetras to eight each add three dwarf gouramies and add 4 ballon mollies. You could also add some kind of shrimp such as blueberry or cherry as for numbers on the shrimp start with 8 and they will breed then you will have yourself a wonderful shrimp colony. With this stocking I would do a 40 percent weekly water change. Is your tank planted shrimp love plants.
I agree with upping the schools to 8 but i would not do 3 dwarfs there will be a lot of fighting I would do a honey or pearl gourami instead. I would also not do shrimp as IMO they will all be eaten instead I would do a school of 8 panda cories.
No it is not it depends on your stock and type of tetra ask and I should be able to help. Most of the time it is 6 but the more the better for some types it often helps lower fin nipping etc
Are you adding anything else or just that cause you could have a school of eight of each with a Betta and a larger type of shrimp such as ghost In 30 gallon. You could most likely even have one of 14 neons and 8 of the other tetras you wanted.
Just keep in mind that red eyes also known as lamp eyes are somewhat notorious for being fin nippers. Increasing your schools will definitely help. any other thoughts on alternate centerpiece fish? I'm sure theres alternatives to the usual gourami recommendation.