Algae or Sediment?

[madwil]

yep, it sounds like just dirt/sediment from your water...
As Janet said, you need to get your FC maintained, with some clarifier, and then worry about the rest of the balance
If pH is way off (<7 or >8) adjust the pH soon also!

[aylad]

I'll have to disagree with madwil on one point-- clarifiers are rarely necessary, and if the water is clearing without it, don't add something you don't need!

Janet

[madwil]

I agree- was still asleep this morning, meant CYA! (conditioner)