dirty sand

[wetone]

I have algae, some brown, some red/pink growing in spots on the surface of my sand. I have had die off on my turbos and hermits so there are only a few and I know I need to get some more, but, is there anything other than lack of cleanup crew that is causing this. I have no readable nitrates or phos. I just started using a new RO/DI about 1 month ago. I have done about 75g worth of water change on a 75G tank and about 40G of sump. There could be some silicates or other nutrient in there from prior to the new RO/DI. I also have a new PM bullet 2 skimmer which is making kick ass anounts of gunk.
Any thoughts on this algae???

 

[fshhub]

a couple of things
what is your circulation like,
also you should probably test for phosphates, definitely would not hurt
but there is definitely some garbage in the water. if the skimmer is producing that much gunk.
skimmers do NOT produce teh gunk, but pull nutrients out of the water, which results in gunk.

 

[wetone]

Phosphates are undetectable using a Salifert kit. I have 3 large power heads moving quite a bit of water in the tank. I know I need some other cleanup crew, but what about things like carbon or chemipure etc.....