So, I just picked up my coworkers 75 gallon tank that I bought off him for Christmas. He had it running but wasn't givin any TLC. Can I use the sand that was in there. There is a lot of sand and new live sand can be expensive. So should I use it or just pitch it and buy new sand? Or is there a way that I can recycle it?
PS. How do you clean Live rock. Its nice rock just seems to have squishy spots on it. I think that's sponge but can't tell.
PS. How do you clean Live rock. Its nice rock just seems to have squishy spots on it. I think that's sponge but can't tell.

