First, move the 19 yr olds to the selling tank, then i always drop the first eggs in, buy another batch, drop them in then buy ANOTHER batch and drop them in. you will have $60 left. then when all of them grow up, theres normally a couple Greenfin Spotanus or a Twin-fin and Spined, which u mate together. then sell the rest of the ones that are not the Green-fin or Twin-fin and Spined. keep breeding the green-fins like crazy, and selling them for $65. soon u will have enought to get your extra tank and the research u need to get the exotic ones! if u DONT get the Spotanus u need, just restart! i hope that helps some people! i hope it was ok to do this! i did put spoiler in the title!