Hello everyone,im new to this site!!! Ive got a 200lt tank with 1(6-7inch) tiger oscar,1 (5-6inch) black shark,1 (3-4inch) flying fox and 4 (4-5inch) silver dollars. All brought from babys,although the oscar was the last to be put in the tank only 6 months ago Ive got an over sized external filer fluval 305 running with no problems,the tank it self has been running for 2 years now. Ive done some research on oscars and i know my tank is over stocked,now the oscar is bigger!! but what fish do i let go the dollars,fox,or shark?? Thanks Chris.