DNA
New member
It's likely to be already on your rocks if you look carefully.
The sand is ideal for diatoms since it contains silicates.
For cyanobacteria it's lack of flow and accumulation of organics that makes it bloom.
Dynoflagellates and the above are easiest to see on the white sandbed, but can be in other places as well.
If you like sand in your tank I'd use other measures for the problem than moving it.
Suck up the gunk in your sand and see how it goes.
The sand is ideal for diatoms since it contains silicates.
For cyanobacteria it's lack of flow and accumulation of organics that makes it bloom.
Dynoflagellates and the above are easiest to see on the white sandbed, but can be in other places as well.
If you like sand in your tank I'd use other measures for the problem than moving it.
Suck up the gunk in your sand and see how it goes.