If you are sick and every third breath means a coughing hacking session that scares your animals... DON'T DO ANYTHING. This especially applies to BIG TANK projects. Now I have the wonderful prospect of disassembling a show tank so I can acid wash the mineral deposits off!! AAARRRRGGHHH!!!!! I think this is going to have to wait a month or two. I really don't want to bother the axos' again. Poor things! Sharon