Little history. After more than forty years away from fishkeeping I got back into it four years ago. Yes, I'm getting long in tooth. I have presently four tanks up and running. A 29 with four Rosy Barbs, 55 with four young Angels and six Harlequin Rasboras, another 55 with two adult Angels, and a 30 with 6 Lemon Tetras I've had for six weeks and plan to move in with the Angels. In reserve I have a 26 that is not presently running and two 10's and a 5 gallon. I am getting a trio of Blue Moscow guppies. Thinking of putting them in the thirty gallon that the Lemons are coming out of. My plan is to hopefully get more males from the two females and not keep too many females. Breeder says females have already been hit with her breeder male. So assuming they will have fry shortly. Been ages since I've had guppies. How old do they need to get before culling for males or deformities? Thanks for any suggestions on this and my tank stocking as well.