I have a 30g w/no lr/ls,a 110w pc that I have had going for 1 year, 1clarki, 2yellow tails and a valintini puffer my levals are great 10 nitrates,ph 8,bought a mush rock from lfs that has about 10 good size ones on it for $30. I put it in the tank and it seems to be okay opened up and looks...