I love my chinese algae eaters. Actually, I am down to one now - the two normal colored ones I had I gave to my sister for her pond - she has TONS of algae (or should I say had). I kept my yellow cae since that one was my favorite of the three. From looking at the pics in your other thread, it looks like you have at least one chinese algae eater. The others I am not sure about. They could be flying foxes or siamese algae eaters. What size tank do you have? They could get along fine as long as the tank is large enough. The chinese algae eater will need at least 20 gallons right away with the idea of moving him into a larger tank (55 gallons or more). He will also need at least two (but will prefer more) hiding holes such as caves or hollow logs. He will eat mostly algae for the first several months, but then will want meatier foods as he grows. He will still munch on the algae, but will need shrimp pellets or bottom feeder
omnivore tablets. Mine loved the omnivore tablets when I had them in for the winter. For their size, chinese algae eaters are little piggies. They will eat 3-4 tablets each night and still keep most of the moss off the tank. The main two reasons they go after other fish in the tank is #1 hunger and #2 territory. If you cover these two things, then you shouldn't have any problems with aggression.
Here are some pics of my yellow (most of the time) chinese algae eater and then some pics of the two normal colored ones going into my sister's pond. As you can see, there was a lot of moss - Most of that is now gone.
Oh, and I saw my yellow cae today out in the pond - he has turned completely yellow again - not a speck of green/gray (or any other color) anywhere...