DIY Lego Pleco Cave

Make a breeding cave for your plecos out of Legos! Attach Lego blocks in two rows on a small Lego mat to make the walls of the cave with angled pieces around the cave entrance. Build a wall for the back of the cave and place weighted Lego blocks around the cave. Use flat Lego pieces and a hinged Lego to make the roof of the cave and place the cave in your tank.