I currently have a 150 with a 40 gallon sump. 2 golden oscars about 6-7 inches and 1 albino oscar 2 inches. They get along great for now. There are also 2 crayfish in there roaming the bottom with plenty of hiding spots. I am wondering what else I can put in there with them. The tank is 6 foot long 18 deep and 24 high. I tried silver dollars at the same time I put the little oscar in and they got torn to shreads. Also tried tinfoil barbs. They were kinda small but not smaller than the albino oscar and they left him alone. its weird i got the SD and tinbarbs and they all get eaten and the little oscar swims with the 2 bigger oscars like they are a little family. I dont get it. Any suggestions on tank mates would be great.