Vanish Posted February 19, 2022 Share Posted February 19, 2022 (edited) I had some extra coroplast on hand from another project, so I thought I would try building some fry boxes instead of buying and hacking plastic boxes. Both white and black work. I like the black for aesthetic reasons, but it means an extra step of painting the inside. I have had two boxes running for three weeks and all has been great, so I am making two more. For this project, I decided I wanted my boxes to fit a 20 long and be 5 inches wide, with a 2 inch water depth. Why? Seemed like a good size! 😄 If you have better reasons for sizes, let me know! Step 1: Cut a piece of coroplast 11 1/2" (the width of the inner tank trim) x 11 3/4" (3.5 side + 3.5 side + 4 3/4 bottom) Make sure the "grain" of the coroplast follows the short dimension Step 2: Create a 1/4" notch on each side, leaving a 3/4" tab on all 4 ends. This is the material that holds the box in the tank. Step 3: Cut only halfway through each side 3.5" down, and fold up the sides of the coroplast. Step 4: Cut end pieces, and a small piece to hold the filter sponge/foam. 4 3/4" x 3 1/4" - This is the back wall. The 1/4" gap allows running air/water lines into the box as well as provides an emergency overflow, should somehow the sponge clog. Unlikely. 4 3/4" x 2" - This is your overflow and sets the water height inside the fry box. 4 3/4" x 3/8" - This holds the sponge in place Step 4: Cut a piece of filter foam/sponge ( 4 3/4" x 3.5" + a tiny extra). Cut it just slightly oversize to create some compression to help hold it in place. The PPI should be dense enough to prevent fry from escaping. I don't even know what mine is. It is pretty coarse, but nobody has escaped yet. Step 5: Glue in the end pieces. Leaving a little overhang can help you seal it better later. I used water safe hot glue and am curious how long it will last in the long run. Probably better would be superglue+silicone. All good so far though. Step 6: Glue in the filter retainer. This should compress the foam slightly. Step 7: Fit and water check. Step 8 (optional): If you're using black, dry and paint the inside white. I used Krylon Fusion. It will be impossible to see the fry on black. Step 9 (optional): Cut some glass or plastic lids. This is really where my guide ends, as how you choose to pump water and/or air is up to you, but I will show mine anyway. Step 10: Run water and air (not shown) lines through the 1/4 " gap. I am currently using Tom's aqualifter for water because I had it sitting unused. Step 11: Add some moss and eggs/fry! Edited February 19, 2022 by Vanish 10 2 Link to comment Share on other sites More sharing options...
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