This tank is now a 5.5 gallon I picked up at Petco the other day. It had a small chip on the corner of the front so i asked for a discount and got 20%. I got it home and removed the chipped glass and took a junk 29 gallon i had in the garage and cut a piece out of the side out. I already siliconed the new 1/4" glass to the back of the 5.5. I will water test it tomorrow and then start drilling new holes. I wasn't happy with the 3/4" overflow on the 2.5 so I'm going to try and find my 1" bulkhead bit for this one.