Hey I liked the looks of that vacuum. I ordered one form Big Al's for 5.49. I have the battery operated one from Eheim but sometimes it does not do well in shallow tanks.As recommended by Tex Gal, do not overfeed. When you do NOT overfeed, the gravel surface remains very very clean. But when there was a need to clean, I found Penn-Plax's Air-Vac to be quite effective:
Oh, I almost forgot my clean-up crew - the pond snails. They do a very good job at picking up any left over. Thus, the gravel surface remains spotless.
Thanks for the post.