If you do want to invest and I say invest bc they are quite expensive I bought the vision cb70 for my balls. It was quite easy to set up. But pro racks are on the pricey side. I went with this for my adults bc I didn't have the time or the knowhow at that time to build my own. I've also make shifted a very simple shoebox system for my babies and yearlings which are around 200-1000gms. I had these wire shelf racks lying around my house from when I went with racks over tanks for some of my gex. Instead if having tank stands for all the tanks I put them in these shelf systems. Anyways they are like 50$ at any walmart. Most of the time you can get them with 3-8 shelves. So I measured out the height of the tubs that I was using for my little ones and set the shelves that distance apart so the tubs sit snug on the shelves. I wired in the flex watt in-between the rungs on the shelves and put heat insulation tape on the bottom of each shelf. Put the tubs on them hooked it up to a thermostat and whala a rack for the babies. Draw back you have to use the tops on the tubs. But since you have a few at the moment this could would work until you can save the $ or have time to build one. I'm in the process of starting a new youngster rack. Id Like one that will hold up to 100 youngsters. Aswell as one that works like my adults cb70 so I'm basing it on that. Babies won't do well In the cb70 bc it's just too big. Well hope it all works out for you.
Morgan