I'm new at all this and am so upset. A rust colored stain has appeared on the gravel and in the fliter pad of our 10 gallon aquarium. Any thoughts on what is causing this? Thanks in advance! 
Riso-chan said:Yes, there are fish that eat algea that could help you. Some of the small bottom feeding fish(Not common plecos, they'll get too big) like cory cats, gold nugget, zebra, and other smaller plecos. I've also heard amano shrimp are helpful, but you'll need alot of them. I have 30 ghost shrimp in my 55g, fun to watch. Good luck with everything! Just so happens I'm dealing with the same issue, but it's not outta hand yet.
I don't know if this helps or not, but I went through a similar situation where instead of having red/brown algae all over, I had unicellular green algae suddenly explode overnight (called "greenwater"). I tried several things, and finally got a HOT Magnum canister filter by Marineland. I used the optional water polishing cartridge that they sell for removing microscopic particles in water. Not only did it suck the algae spores from the water, it never came back.basketmommy said:Are there fish that eat algae? Something you can add to the water? Do you have any thoughts on why this would suddenly appear. I"ve had the tank for about 6 months and we've never seen this before. Thanks!
Ditto on the OTO's. They thrive on brown algae, if that's what you got. What other fish do have in the tank? And how big is the tank?Darkblade48 said:AFAIK, Corys don't eat algae, whereas Otos do a great job on soft algae (such as diatom)