Is this Diatoms?

[TimT]

Hi,

*1 on dinos.

The thing with dinos is that there are many different types, some toxic(red tide is a dino) and some not.
Turbo snails and trochus snails will eat the non toxic variety.
Lights out regime may or may not work
Chemi Clean or Algae X may or may not work
peroxide works but is potentially dangerous and will kill shrimp and xenia.
make sure your tank is kept clean of detritus and regular water changes are done.

Here is some reading for you:
http://www.reefcentral.com/forums/sh....php?t=2082359

Cheers,
Tim

ps If your Phosphates are high try some Foz Down. Safe, cheap and easy phosphate control.