Algae attack
 

is this a Dinoflagellates algae?? what is the best way to control it?

http://i652.photobucket.com/albums/u...ps6571fbea.jpg

cyano bacteria , chemi clean and a little maintanance tweaking will clear that right up:)

cheers

denny

just went through that myself, found out it was my sand, god i hate seeing that good luck keep up with the water changes

Whatch the chemi clean for inverts I had it kill off ,a bunch of snails , tuxedo urchin ,sandsifting starfish it worked well its been 3 months and its totally gone but my critters paid the price , make sure that you make changes as to what caused the out break before you do the chemi clean or it will just come back

It never bothered my clam, snails, hermits, or shrimp. I don't think I've used it since I've had the urchin though. I always put an airstone in the tank to keep up oxygen levels.

Thank all for the advice.