I have a 72 bow front tank with 50 pds. of LV looks kind of empty. My fish, 1 clown 3 tangs 1gamma 3 shrimps 1 black cap. My question is. If I add more cured LV can that affect my water.Also, do I need to leave space in the back part of my tank or can I lay them back even if they touch the glass in order to stack them up.