What is better 2 part or Ca Reactor. I have added alot of SPS to my tank and they were growing fast and now things have slowed down I have tested my Ca looks as though I am going to have to start upping the dose of 2 part. I went from 50ml to 75ml things are looking alittle better butI think I need to add even more. But it is time to purchase more 2 Part but thinking should I just go back to a reactor now that tank is mainly SPS?