Grey mat algae?????

Hey guys,
My 110 has been up and running for a couple of months now with 4 green chromis, the yellow tailed blue damsel was way to agressive with them so he now lives in the fuge until I decide what to do with him. For a little background I dumped everything, including the water, from my 55 into the 110. The 55 was up for a year. Moving everything and topping off the 110 of course started a new cylce. The brown algae is disappearing and I'm starting to get a little bit of green algae, the hermits seem to be taking care of that though. Here is the question, I am starting to find what appears to be a grey colored substance on the surface of the shallow sandbed. It grows if I leave it alone and when I stir it up it does not separate but stays together in a matt form. I'd post some pics but not sure how yet. As of 3 days ago my paramaters were: Ammonia Nitrite Nitrate and Phosphate were all 0, calcium was 380, PH 8.3, SG 1.024, KH 196.9, Alk 2.9. Thanks for the help.

 

Do you have any nassaruis snails in there. Just wondering. The worked wonders for my sand bed....

 

No but maybe it's time to get some. Do they actually sift the sand?

 

i don't think thet sift it.they sleep under it till they smell food or until dark,then come out.i guess they stir it just buy doing that all the time.they don't always go to the same spot so they stir all over.your tanks big enough for a sand sifting star fish.i don't know much about them cause i have a smaller tank.

 

Any recommendations on the star fish? It's got to be hardy!

 

I had a serpent star. It did alot of scavenger work. My lfs said 1 per 10 gallon. I did one....

 

Are serpent stars reef safe? i hear conflicting opinions about them...

Maybe its Cyano?

 

My first thought was Cyano but it does not have the red color I've seen before. It's more of a brownish grey color.

 

I was told they were. I'm pretty new so ask around before taking my advice...

 

What about a couple sea cucumbers. they sift sand. I had one in my tank until I smooshed it moving a rock around.. A serpent star doesn't sift anything..... Sea cucumbers and nassaruis snail would be my choice.. I had 5 nassaruis snails in my 12 gallon nano.....