Hi. Does anyone know what algae I should not get? I 've read a few threads here that have me petrified now. I have a lot of algae, possibly known as scrub algae and I've read some places here that some algae can destroy your tank when it becomes sexual. Why does everything have to be so hard!!! I just thought algae was algae and that it was good to have in my smaller tank to help with nitrates, which, by the way, it isn't. The algae was given to me by one of my fish stores I've spent a lot of $$ at and he said it would be good for my nitrates. It does look like a green scrubber to scrub dishes but now I have ton floating on the top of the water and now I'm scared it's bad. Please let me know if anyone has any idea on this. Thanks.