Welcome to Simply!! It sounds like you have a well thought out plan. A 37 is perfect for this size, number and especially for QT. It won't take them long to out grow this tank, so if you don't have another intermediate tank on hand I would personally transfer them when they hit about 3.75", although with your excellent water change routine you may be able to make it to 4". Pounding them with food early on is your best chance to get some good growth on them at this early stage of development so just make sure to stay on top of your water changes!!!