i am getting my 75 gallon tank next week for my upgrade. not sure what size tank can fit under a wrought iron stand for a 75, but i wanted to make my own sump/refugium. i have googled the s**t out "DIY sump/refugium" but have seen/read so much info i think i got myself more lost than anything. its a regular 75 gallon, no overflow built in or anything so i figure i would need to purchase an in tank overflow, i have a basic idea of how i should do this but not completely sure. i want to find a way without having to drill holes in my tank, and dont mind having to have pvc leading into the top of the tank as my return and feedback. just looking for the most simple and effective design for this and any feedback/ideas/links that wont confuse the crap out of me would be greatly appreciated.