Hi, like to check if it's feasible to diy a sump from an existing freshwater tank. Planning to convert to marine but the tank is 5mm condition about 6-7 out of 10. Tank size is 4ft by 1.5 by 1.5. I've all the glass already since I stripped my 3ft tanks. Just need to cut to size. I tried using a diamond cutter but the tipped looks like it got scrapped. Did I scrape it too hard? Still can't break the glass though. Seen youtube on it but still have trouble.
Any help/advice would be great.
Thanks:)