Anita Posted February 25, 2021 Share Posted February 25, 2021 (edited) Fun discussion on Opinions on Under Gravel Filters started by @Goosedub. Funnily enough, I just finished a UGF modification that I hope will help avoid channeling, clogging, and trapped fry issues. This build provides some mechanical filtration, boosts filtration media surface area, reduces weight of the substrate (because foam weighs so much less than gravel), and lets me use coarse substrate (pea gravel). Disclaimer: I installed this in a small, 10-gal, vertical (tall), hemispherical tank, which helps alleviate the problem of diminishing flow:distance ratio that would be more problematic in a larger volume, horizontal (low and wide, aka breeder) tank. Note: I purchased the Penn-Plax Premium UGF for 40-55 Gallons ($17.99), which comes with four plates and four uplift tubes. That's enough to outfit two of my 10-gal tanks. Okey dokey, here is what I did. 😎 Step 1: Trim coarse foam to fit the bottom of the tank, leaving a 1/2" margin. Step 2: Trim UGF plate to fit bottom of the tank, again leaving 1/2" margin. The Penn-Plax plate is relatively soft plastic, so I used sharp scissors. Step 3: Install uplift tubes, no-clog air stones, and vinyl tubing. I like the Penn-Plax UGF because the uplift tubes twist and lock into the plate. This helps keep me from accidently dislodging them when I gravel vacuum, embed root tabs, or move plants around. Step 4: Cover with approx. 1 inch of gravel. Trimming the foam and UGF plate with a 1/2" margin lets me hide them behind the gravel. Add water, plants. Hook up air pump. Voila! With such a small tank, I decided against using a powerhead. The photo was taken after running air for about 24 hours. The water cleared up over the next couple of days. The blue line marks the level of the UGF filter plate. Here is what the tank looks like today, roughly 2 weeks later. So far, so good! 🤓 Edited February 25, 2021 by Anita a little clean-up 2 Link to comment Share on other sites More sharing options...
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