The successful SPS tank

[straightrazorguy]

Originally Posted by Treebeard

Not often. Nitrates have been negligible and phosphates zero according to my Hanna tester. Sometimes I have my doubts with the accuracy of the Hanna, however I do not have any issues with algae so I assume phosphates are in check.

Then it's your lighting. Get a PAR meter and check out what your acros are getting...