Hi Freckles, as far as the coralline IME, adding a alk buffer really helps the purple stuff. When my dkh readings were low and I started using a 2 part, the coralline took off. Of course you don't want to add chems if you don't need it so always test first. You can also get some scrapings from a tank at the lfs and sprinkle it in your tank, it will "seed" it. Eventually it will grow and grow and grow, your arm will get tired from all the glass cleaning  HTH
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nickg<br />LIFE TASTES GOOD!
55g display, 10g sump, 5g refugium
single, siphon overflow to sump, rio 2100 return, ref is pumped from sump, and returned via gravity/bulkhead. Big in-sump skimmer w/cap 2200 pump, various maxijets in display. temp 82
<a href="http://www.nickg309reef.iwarp.com">MY TANK SITE</a>
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