My 10g tank in the kitchen had algae eaters, zeb danios and a single 5" chalceus in. I moved the danios and algae eaters into a new 200g to aid cycling which just left the chalceus on its own in the 10g. I now understand why a lot of hobbyists say that algae eaters are the best fish in the hobby to keep algae at bay. My 10g is overrun with it. It dosen't bother me as this small tank in the kitchen is not exactly a show tank so what it looks like is not an issue, it was just meant to keep the kids happy. An up side is that my nitrates are just not rising at all. It was 2 weeks ago that i last did a partial on this little tank and i've tested nitrate tonight and it's about 2 or 3ppm. It'great. Is this down to the algae mopping up my nitrate or is it just simply down to the fact that the chalceus is the only fish in this tank now so my bio load has decreased. More importantly is there a downside to having lots of algae in a tank other than cosmetic reasons?