02-04-2011, 08:19 PM
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Do not listen the previous post and get Otos. Your tank doesn't have live plants (they do better with live ones) and doesn't look to have an ample supply of algae. Otos need algae to live and when that is gone you need to feed them algae tabs.
Corydoras are not scavenging fish, in fact most bottom dwellers really aren't scavengers. They just feed from the substrate and their mouths are turned downward due to evolution. Corys need to be kept in schools.
Walmart should be banned from selling fish, I'm not sure why people buy them there... it's depressing. A store that completely lacks customer service should not be allowed to deal with animals. Go to your local fish store and buy the same fish for $5. You'll have a much better chance at keeping it long term and won't be buying infected fish that could possibly kill its tankmates.
Dwarf Gouramis can be territorial, so keep an eye on them, usually people only keep one of them in a tank. You seem to have areas they could designate as their territories though, which would help in reducing aggression. I'm not saying it won't work, just look for harassment signs on your fish.