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some caulerpa is nice and red macro looks good - watch out for the caulerpa going sexual
it can be difficult and frustrating to attatch algae to anything without it blowing away and never being found again... try weights or rubber bands but remember the octo may move them and if the are not secured they will get lost under the rock
micro? umm did i say that... im not sure that that is the right name...lol... but i would say that is the bad stuff - a general name for green brown diatoms etc
or did u mean what does it mean when caulerpa goes sexual - it releases spores or summin which clouds the tank starves it of oxygen and causes algal blooms i think too
not good anyway...