ok. What kind of algae eater would you guys say works best for such a tank?Otos are not a good idea in a tank that size. They need to be in large groups (10+) and there is NOT enough algae in a tank that size to support a group of them and most otos will not accept commercially prepared diets.
okI put 5 in a heavily planted 15. It's best to wait a couple months so they have plenty to eat.
guppies are algae eaters?Shrimps are good; also guppies are very good; american flag fishes are also good algae eaters - but might be pushing what you want to put in a 15 gallon esp if you have other stocking.
I don't really want a fish that is very big. Would 12 ember tetras and 5 amanos work?Most live bearers will willing eat algae if they are hungry. Swordtails are better but 15 is too small for swordtails. Also the american flag fish is pretty small - around 2 inches so you might find them interesting.
That is true they would look like dinosaurs walking around the tank....lolA low tech iwagumi with one or several moss species as carpet with patches of buces also on the rocks would require minimal light, no CO2 and increase your options with fish. Ember tetras would be an option, although I favor asian species with buces myself.
For high tech, bright lights and CO2, I would not recommend fish.
In both cases, I would not recommend amano. If only because of odd looking proportions of a 15 Gallon Iwagumi with large invertebrates. Neocaridina shrimp are the way to go.