I have been in the market for used aquariums for a couple of weeks now to breed convicts to feed my jags and today i came across 3-20 gal tanks 2-30 gal tanks and 1-55 gal tank all with pumps for $150 (good deal imo). I plan on using the 55gal for convicts and the 30gal tanks for fry. My quesion is will the convicts breed fast enough to feed my jags one every couple of days or should i use the 3-20 gal tanks to breed guppys or mollys too?