Proper Gravel-Vac Size, 2.5 gallon tank?

a href="http://www.petco.com/product/104980/Lee-s-Self-Start-Stretch-Ultra-Gravel-Vac.aspx" rel="nofollow"http://www.petco.com/product/104980/Lee-…/a I think that gravel vacuum/siphon is the only one of its kind. It is great for small tanks, unlike most gravel vacuums. I even have used this in my 1.5 gallon betta tank. This should be perfect for your 2.5 gallon tank.