Removing the black in the sand.

[blacknife]

My 15g addon has about a 2 inch sand bed in it. The sand i can see in the front has gotten a big black patch in it.

right now the tank is almost empty on a lights off regiem. I tried using 4 24 inch cool white shop lights to just use it as a fuge with LR and the algaee went crazy. its in that time the black showed up as well.

There is also some black in the small dsb part of my sump although i think i will just remove that when i modify my sump in the near future. just leaving that chamber empty or putting more LR in there instead.

if i put a few more sand snails in there will the black slowly go away or will the snails avoid the black area?


should i just remove the sand?


would that sand be ok after a good washing to make frag plugs out of?