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It depends solely on what alkalinity and calcium levels u r trying to maintain plus your tanks faily needs vs. Dosing, etc. I use IO reef crystals because i maintain levels of 10 for alk and around 430 for calcium. And inbetween water changes i dose to maintain those levels. If u trying to maintain lower levels or have less needs per your tank then the standard I/O will work better.
Your tank will eat the alk and even a water change probably won’t bring it back up much anyway.how do you keep alk at 10 while RC alk is at 13 when freshly mixed?
how do you keep alk at 10 while RC alk is at 13 when freshly mixed?
And costs almost 2 1/2 times as much. I don't care who does what gallon to gallon comparison, when I can buy a 200G box of IO for $40, and tropic marin is nearly $100 for 200G. I don't see how anyone can say that they are nearly the same in price.Tropic marin mixes cleaner

