by the way im not good at expressing my thoughts very well BUT ---- basically if your up north & need to HEAT your water in winter an above ground tank is maybe easier to heat up than an inground one for tilapia for example &&& if ya in the south an inground pool might be better to help lower the water temp in summer & warm it in winter slightly also ?? ----but of corase theres always means of changing water temps with electric & woodstoves and endless other ideas --BUT im a cheapskate so I wanna try doing it as cheaply as possible