Reef nutrition

Sump Baffles

Matthew Meyer

Supporting Member
Had the acrylic sump baffles come loose in the glass aquarium (sump) again. I have been using different super glues but nothing has been working. Would JB water weld work better to bond the acrylic to the glass?


Supporting Member
I put together a diy glass sump with 3 sections for about $40 with a free 40 breeder from Craigslist in the past. I recently gave it to a member on here.

Be sure to measure the inside panes accurately then subtract 3/32”-1/8” (1/16” gap on each side) for the silicone bead to fill and use your desired water level as the height for the glass.


Supporting Member
Be careful with acrylic baffles and glass tanks. If you get them too tight to the glass, it can crack the glass when the acrylic expands. That being said, I have had success in the past just putting a big bead of silicone on either side of the acrylic. Should be able to hold. As long as you don't have a drastic water level difference from one side of the baffle to the other, there shouldn't be that much force on the silicone.