Hello! I have been researching in the reef side of the hobby and I am currently getting all the equipment I need just one problem, everything I need is expensive! Total cost of all the equipment is about 1,000 dollars, so I decided I need to make some money and what better way to do it with fish! The 20 gallon long is currently freshwater but I am planning to move it to a saltwater reef tank (with equipment) in about a year, so is there any good freshwater fish to breed for profit in my 20 gallon long, the fish can't be too expensive because im trying to earn money not waste it ! Any advice will be nice, thanks again.