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Yes, I have had lots of experience with Oscars. One of mine died recently from a sickness. Algae eater fish are not dominant, in this case the Oscar does not take it as a threat and does not bother it. The answer to your question is yes, an Oscar can live with an algae eater fish.
Young Oscars should be kept in groups of 5 or more of a similar size to avoid too much bullying pressure being put on one fish. The weakest fish will be killed if there are less.
Yes, keep in mind seahorses are one of the most timid sea creatures.
Well I'm guessing that you have more than one in the tank, right? If you do I'm sure it's because they are trying to attract one another to breed. Fish attract each other by shaking and flashing their fins.
It all depends on how much other fish you have in the tank. Oscars need a lot of room so if there's tons of other fish in there it could cause problems. But if you have a couple it would be fine. If its a male Oscar its probably best you don't have them in a tank with any other Oscars. I volunteer at a pet store where they sell the fish so that's how I know this..
There is 1 way to tell on the male Oscar fish there are two small holes where his bum is there is another hole witch will be the same size unless its just had a poo haha but on the female Oscar there is two holes and one is bigger than the other and one is the anus and the othere is you know what hope this helps
You can feed them frozen fish foods, Oscar pellets, and flakes. IT is best you feed them a variety of foods rather than just one.
Most pet shops can order them in if they don't have one or two in stock.
Keep them in separate tanks.
Provided the other community fish are also large cichlids and the tank is a very large one (at least 8 foot x 2 foot x 2 foot) they will be OK. Only an idiot would consider placing an Oscar in with small fish.
I think Mutualism would be um.. Fish and other fish. One fish helps the other by protecting it, and the other one shares it"s food with the other fish. It may not be the best answer. Bt its all i could think of.. sorry :P
If the tank is large enough. For rearing young Oscars a 50 gallon tank is about right for 5 fish.