i have a 100 gallon 5 foot tank looking to use the space under the tank better as my sump takes up about 60-70 percent of the underside i want to add in full auto waterchange but am out of room given size of what is below (sump has waisted space could save like 6-8 inches length if i built my own to fit the tank) i want to use as much room as possible for the autowaterchange and ato system. if i wanted to have the res be lets say 30 inches tall and 21L and 21w with 3 sections in it (salt, waist, and fresh) what thickness acrylic would work half inch seems fine as i will sealed lid and supports any thoughts
