red algae

[ErikH]

Check here and see if you can identify the algae.

http://www.melevsreef.com/id/algae.html

Oh and for coraline growth, you will need to read this;

http://www.wetwebmedia.com/calcalkmar.htm

Make sure to buy the proper test kits, such as Salifert. Keep a log, figure out your CA, Alk. and Mg demands. After that figure out what you need to supplement to maintain those levels on a daily dosing schedule, or as needed. The more corals you add, the higher the demand.