my substrate is about 5" of plain white sand (cant recall the brand) but its very small grain.. almost sugar sized.
About .5" up to 2" into the sand I've noticed its turning dark gray in spots.. almost black. Is this normal? Ive also had a small Cayno breakout and it seems to be surfacing primarily above this discolored area.
its a 55gal tank thats been set up for nearly 6 months now. All levels are spot-on.
About .5" up to 2" into the sand I've noticed its turning dark gray in spots.. almost black. Is this normal? Ive also had a small Cayno breakout and it seems to be surfacing primarily above this discolored area.
its a 55gal tank thats been set up for nearly 6 months now. All levels are spot-on.