For different sump/refugium ideas and designs go to melevsreef.com. i used a regular glass fish tank and went to a local glass shop and had them cut 1/4 inch glass panels for me. Then used a 100% clear silicone to install them. For my over under over baffles between skimmer chamber and return chamber i took a tape measure and level and a sharpie and drew lines for reference. Then i took the first baffle and siliconed it in place with bottom edge of glass sitting on the bottom of tank let it set up for hour or two, then took a piece of 2x4 and layed it on bottom of tank and made 2 thick beads of silicone down the reference lines and pushed the glass panel into silicone, then siliconed the open side. I used a piece of tubing to reach down between the baffles to smooth out silicone on back side of panel..... let that one setup for several hours to ensure when i removed 2x4 that the panel wouldnt sag or drop, then installed last panel same way only with bottom edge sitting on bottom of tank......