Moss Rock is growing... moss???

[riot]

I put some moss rock in my 29g tank when I set it up. These rocks passed the vinegar test and were heavily washed. The past two days I noticed significant green growth on them. I attached a pic below. Could this in anyway be dangerous to my fish. The water is testing fine althought nitrates have gone up a small bit. I will be doing a 25% water change in the next day or so if the nitrates get any higher than they are now.

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[Fishalicious]

Does it rub off really easy and smell a bit? It is hard to see from the piccies but it looks a bit like blue green algae...

[riot]

It is a little blue-ish. The pleco wont touch it though. There was a bit of darker green algae that he ate quick style.

[riot]

I just scraped some off. It didnt come off too easily and I didnt notice a smell. It's not slimey at all either. It's kinda coarse.

[Fishalicious]

If it doesn't come off easy and doesn't smell then it is probably just healthy green algae... it can look really nice once it grows and it keeps nitrates low.