Well i cleaned it the best i could and it is still blackish but definitely not as black as it used to be... what i noticed was this rock has a lot of of 3in holes with sponges in them. I don't think i have enough sand in my tank i had more than enough in the 55gal but in the 80 its about 1in tall. Will it be alright if i buy a bag of live sand and add it?