This is a pretty standard gravel vac. Yes, it does have the extra wide head (in the shape of flattened hose, so its wide width-wise, but narrow height-wise), and that does let you get into spots that you otherwise would not be able to reach. I have been using this with a 55 gallon and a 29 gallon tank. The medium size seems to work well.This gravel vac also comes with a nice clip, so you can attach the clip to the bucket that the water is going into and not have to worry about the hose popping up while you are reaching around the tank. If you've ever had a hose come out of the bucket and spray water over the floor while you're cleaning a tank, you will recognize how nice a feature this is.Here's how you get it to work:1) Get the water bucket ready and hold the large side of the tube in one hand and the thin end of the tube in another hand.2) Submerge the large end in the fish tank so that the tube fills up with water.3) Put your finger on the end of the narrow side of the tube.4) Raise the fat side of the tube up out of the aquarium just a bit as you let a little bit of air out of the tube from the skinny end with your finger. The action is just like letting a wee bit of air out of something inflatable.5) As you raise the fat end and let a bit of air out of the skinny end, you will see the water move through the tube. Do this until the water is right at the skinny end of the tube, almost touching your finger.6) By now, much of the water in the fat end will have moved into the tubing. So submerge the fat end into the aquarium again, filling up the whole chamber.7) Let the water bubbles in the tubing clear out.8) Now put the skinny end into the bucket (keep that finger on), and submerge the fat end in the fish tank.9) Remove your finger from the skinny end and the water will spurt out. Viola - your gravel vac is sucking up water.A gravel vac is an essential fish-keeping item, and this is a good one. Get it.
Rating: [5 of 5 Stars!]