Who eats algae...And alot of it ?

Fish shouldnt be purchased for the sole purpose of eating algea. Algea control is a job for the kepper no the fish. Properl lighting control and feeding habits for your fish will keep algea at bay. But if you go to get a fish anyways there are several pleco's that do good jobs like Bristlenose pleco's.

Corys generally are not algae eaters. They sift the substrate and perform a bit of cleanup, but not with algae. Otos were a good choice. It seems that you should plan on around 1 out of 3 otos you buy at a fish store to not make it. I've read somewhere that when they are caught, the water is treated with a tranquilizer....
I also agree with the BN pleco for a little bit of algae control, but they need to have a nice piece of driftwood to chew on as well.

Nerite snails

What type of algae is it? Are you talking green stuff on the glass or long strands coming off everything in your aquarium?

I agree that treating the cause is the best method, rather than buying more animals to eat the algae. That being said, I like the idea of a balanced tank where you have a variety of fish all serving a purpose. Ottos are good algae eaters, but they only eat certain types of algae. The little fish you see at pet stores labeled as "algae eaters" tend to grow huge and become aggressive, but, they do a decent job of eating algae when they're young. Plecos come in a lot of varieties, and the most common one isn't that great an algae eater...plus it grows to around two feet long. Some snails are great for algae, as are some shrimp. Depending on the type of algae, you might find that other fish, such as mollies or even some types of barbs, will eat it.

Pretty much, you can wipe it but it will just come back until the silica is used up in the tank. It will all of a sudden just disappear on its own.

Interestingly, some algaes do go away if you just wait a while...and some just get worse. If you like ottos, you're in luck. Brown algae/diatoms is supposed to be one of their favorite foods.

The good thing about ottos is they are small and stay small, less than 2 inches long at their largest. They're cute, friendly and very cheap. The bad? It's very hard to find healthy ones. Algae eaters get treated poorly when caught, not necessarily out of intentional cruelty, but because they starve, basically. Algae eaters don't tend to flock to food like other fish do. Therefore, when you get them home, they are usually starving. This can cause high initial mortality rate. Basically, if you buy some, they might die in a few days because of the way they were treated before you bought them.

However, if they survive the transition (given that you seem to have lots of algae, they shouldn't hurt for food), they should be fairly easy to take care of until they die of old age, which is about 3 years or so.

That chart is a good source of information on algae. The best way to control it is to make life difficult for it, namely not giving it lots of food and water. One good method is to simply not turn the aquarium light on for a week or two. That should starve it. You can even go so far as to put a blanket over the aquarium to completely black it out, but I've never done this myself. It seems a bit extreme, but if you have a bright room, it may be necessary.

If you have the room and do your regular maintenance BNs are very good, depending on the algae you have, like Kuhlifan stated, Otos are fun.

BNs produce a lot of waste, must have good filtration.
If you get them, don't forget to feed them!

Get a Magfloat! works even better.