The 50 dollar one was ABS and it came with bullheads Ans diamond bits for 50 bucks. Wish I wouldst found that before I ordered buts and bulkheads! ABS is a high quality plastic I would've been happy with it. I went ahead and ordered the one identical to bulk reef supplys for $55. Its cast acrylic and I know its virtually indestructible like my aquac remora. I also learned the importance of a titanium grounding probe for my tank and got one of those at the lfs
. I also bought a GFCI outlet to to put in place of my standard outlet that all my tank equipment was plugged into. Tank is grounded now! Glad I went ahead and did this.