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Coast To Coast Overflow Design. Glass is also cut in 8ft sheets so going to 8ft length could be more ideal. The acrylic coast to coast overflow box made for me by marc at melev's reef i had made to replace my diy glass overflow.
A calfo overflow is also called a coast to coast overflow. Will try and get a picture for you. Just to get some more visuals for design.
A coast to coast overflow advantages design REEF2REEF
2 piece glass internal overflow with two drains. I'm going to change to this, right now i have a coast to coast internal glass overflow box which is problematic. Its a problem that seems to be exclusive to the marine land deep dimensions tanks and is two separate issues. Becoming more increasingly popular is the horizontal weir/overflow system which can be full width across the back of the aquarium (calfo or coast to coast overflow)or partially across the back of the aquarium and with a total depth of around 150mm (6), benefits of this style of weir is greater transfer of surface water removal and being less.