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Hi and Welcome,
You know you are going to have to explain this "slow growth long story" thing you brought up. Start a build thread and tell us all about it. If it was mainly lps, that is why the slow growth. Well, depending on genus really.
I have run sps in small tanks with just water changes, and in a large system with a calcium reactor. I would say in a 90g, you will eventually need to dose (using auto dosing or calcium reactor). Once you get full of sps, your calcium uptake will take too much to not have it automated.
There are plenty of very beautiful sps corals that do not cost a fortune. Plus, you can get small ones from fellow reefers as they grow too much or break. Good luck!!!
Welcome. Instantly ur cool Now! Just like that. Post lots of pics, we all like lots a pics