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Finding the names for corals can be tricky as some folks tend to put thier own spun or hobby name on them. Alot of the time, what would appear to be 4 different species will in fact be the same. You'd need to probably just stick to using its genus
Some of it can also be opinion based too...
Like mentioned 4 is fine. 1 sediment, 1 carbon block, 1 RO membrane and 1 DI unit
You can go more of each but that should get you started off right without any issues