For the gravel vac to work you can do one of three things. Put the siphon end into your tank and move it up and down rapidly till it starts to pull water through. This might take a little bit for it to catch and siphon. You can also suck on the hose till it pulls enough water into the hose. Don't get it in your mouth, just leave a U shape bend in the hose and suck until that U is filled with water, then point it into the bucket, should start the siphon. The final method is the roll the whole thing up and submerge it in the tank so the whole siphon is in the water. Once it fills with water leave the gravel vac end in the water, plug the other end with your thumb and move it out and into your bucket.
Originally Posted by BonsaiGuy
Increasing your biodiversity increases your stability.
You know what this tank needs? ........................ Crypts.