i recently added 3 silver dollars(3in) and an oscar to my j.d./pleco 65 gal tank. the oscar(4in) is about an inch bigger then the jack(3in) ! all seemed to be fine until latly... i noticed the oscar had a few scars on him! so i sat there and watched and watched and sure enough the jack dempsey was bein the bully! however the jack seems to fine wit the silver dollars. now im pondering weather to take the oscar and silvers out, and go wit jus 2 or 3 jacks and the pleco????? would that be reasonable??? thanks!