I have a 110 gallon tank with 1 tiger oscar and 1 pleco with a marineland 350 canister filter system. i was wondering what fish would go along with the oscar? i went by my local fish store and they had a couple fish that caught my eye. 1) a "green scat" they said its a brackish water fish but can live in freshwater and clean up feces. 2) a "Green Terror" it looked really pretty and they said its semi agressive and can go with a tiger oscar. and 3) a "Jack dempsey" ive seen these fish before and love them. so which would be the best for the oscar or any other suggestions?
Green scats don't do well in freshwater when mature. They really need brackish water to thrive. Also, no fish in the world will clean up feces. If someone tells you a fish eats feces, you should stop considering any advice they have given or will ever give you. LOL There are some sifting cichlids (such as geos) that will mulch up the feces into small particles that a filter will pick up, but they don't consume any feces. My old geo tank was the cleanest looking tank I ever owned. The geos would grind up all the poop on the bottom and the filters took care of the rest. From a maintenance standpoint it was the easiest tank I had. A water change and a little filter TLC. No hunting down strands of poop behind and around decor.
The rivulatus and JD would both make great tankmates, but as mentioned above, you would need to obtain them at within 1-2" of the oscars's current size or there is a risk of the oscar overwhelming and killing/eating the newcomer.
Gymnogeophagus labiatus would probably be okay, but because they only reach 5-6" at most, you would need to buy adults. There is a risk of the eventually much larger oscar turning aggressive towards them, but IME, oscars are usually calm babies who won't harm anything unless it's threatening them.
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