On your schooling fish I believe you will be happier if you pick one kind and have a big school. As far as the number of fish, I think you could easily support that number of small fish.
I'm thinking about replacing the threadfin rainbow with diamond or tetras
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In response to the first question, those are all tiny fish and you definitely aren't overstocking the tank. I have some of the same fish (plus more) in my 33 long. That being said, I agree with the other poster that you will likely be happier with a bigger school of one or two of those fish vs. smaller schools. I did a bunch of different types in my 33 and wish I hadn't as they all just get jumbled together. A large school of one type with a couple accent fish or something would have been much more impressive looking.
All that said, I would not put diamonds with any of those fish. Diamonds get to be pretty decent sized compared to the other fish on your list, and they are VERY aggressive eaters. I tried to mix mine with glowlight danios and ended up moving the diamonds to another tank because the danios weren't big enough or rambunctious enough to compete with the diamonds for food. They are peaceful fish on the whole in my experience, but mixing them with smaller fish, especially smaller fish that feed at the surface (like the danios) isn't a great idea.
They swim on the ground, the glowlight tetras swim in the layer from the ground up to about midway, but almost always in the bottom third of the tank.
I'd drop the rainbows and rasboras too and stick to the South American fish in a biotope arrangement. It is easier to provide optimum conditions for fish from 1 geographic area.
I know, it's more a pet peeve. No reason you should not try them if you like them.
Dude, you should see me when I run across a rare fish I love.
In response to the first question, those are all tiny fish and you definitely aren't overstocking the tank. I have some of the same fish (plus more) in my 33 long. That being said, I agree with the other poster that you will likely be happier with a bigger school of one or two of those fish vs. smaller schools. I did a bunch of different types in my 33 and wish I hadn't as they all just get jumbled together. A large school of one type with a couple accent fish or something would have been much more impressive looking.
All that said, I would not put diamonds with any of those fish. Diamonds get to be pretty decent sized compared to the other fish on your list, and they are VERY aggressive eaters. I tried to mix mine with glowlight danios and ended up moving the diamonds to another tank because the danios weren't big enough or rambunctious enough to compete with the diamonds for food. They are peaceful fish on the whole in my experience, but mixing them with smaller fish, especially smaller fish that feed at the surface (like the danios) isn't a great idea.