I started my own Phytoplankton cultures today.
Melevsreef.com - Phytoplankton
Here is is my first culture .I should have 3 bottles of live phytoplankton ready on Sat.The other container in the photo are rotifers .My corals should like that snack.
I agree with Biff and the others there are things that are depleeded from the water and a change is the only way to replace them.I do one big change once a month and small ones weekly.After every change my corals seem to come to life and grow the best .They open up bigger.