im trying to plan my 280 ray tank since im waiting a month for a replacement. (cracked tank) planning 2-3 small rays to start with. (i understand adult size, there are always bigger tanks), i have a 16" niger cat, 10" irwini and a 12" fire eel that will join them. im looking for some mid-top water fish to fill the void. i dont want to add any more big nasty fish so no arowanas, silver dollars. maybe some caracins or small peaceful s/a cichlids. id like to keep the s/a theme