I've made some rules so if I come across something I don't sell it. I say 400 gallons and up anything acrylic for a good deal I will keep and store away for personal use. I have no problem buying and selling smaller tanks as they are easy to get and always a better deal but very rarely do the big ones come up. Especially in ontarioive had some luck with a few big tanks from 180g-900g
but ended up repairing and selling them all lol