What is growing

[ecreef]

So, on my rocks it looks like a light brown fuzz and it has also done this in the sand. It's not all over, but its in spots and almost taking over. I tried to take pictures, but the color does not come out well so it's hard to see. Does anyone know what this may be?

 

[tomu]

How long has the tank been set up? It sounds like an algae? Have you tested for phosphates?

 

[ecreef]

up and running for 6 months before i got it, about a month or two with me, but i just added rock.

 

[tomu]

How long are your lights on? Is the tank near any uncovered windows?

 

[roguemonk]

Is it fuzzy or slimy? If it's slimy-looking it might be cyanobacteria (commonly but inaccurately called Blue-Green Algae - BGA). Otherwise I would think it's probably algae accelerating because of a die off in the new rock or a partial cycle for other reasons. I think your tank is still in a "growth phase" (like mine) and you'll have some cycles of accelerated algae growth while the ecosystem is struggling to find equilibrium. I'd let it go and just slowly add algae-loving creatures (one every few months) to strive for a long-term balance. But if you hate algae you may not want balance.

Brad

 

[bmwardo]

What are your water parameters?