Hi! I have a 50 g freshwater aquarium. It has 3x 1/4 inch snails, 4 goldfish, 1 pictus catfish, one 8 inch pleco, 1 11/2 inch redfin shark, 2 inch leopard ctenopoma. They have been in the tank for about 1/2 year and doing well. i would like to add my 3 inch red tiger oscar to the mix but wonder if that is a wise idea or is everyone going to be eaten? Temp sits at 25 degress.:roll: Thanks!