well i lost my oscar today, im not really sure why it just wasnt actting normal so i moved him to a 10gallon and put in some salt and air bubbles didnt do anything, it just got worse. so i want to replace it, but i dont know with what. im not sure if i should get another oscar or not. i want a fish that swims in the middle of the tank im think a JD, GT or another oscar. the tankmates will be 2 Geophagus Balzani and 4 firemouths. also they are in a 75 gallon tank