any input would help
ummm dirt. organic miracle grow potting soil 1 1/2 inch layer. 50 pound bag at home deopt sells for 8-10 bucks. next get sand also at home depot like 5-7 bucks for 50 pounds. they also sell gravel of different sizes.
i wouldent dirt a 75 gal. too messy. id use 3 inches of sand/peagravel mix
eww good idea michel. but wen dirting a 75 u dont dirt the whole thing you plan out where you are going to put plants and only dirt that area. its part of planning a tank that big out.