So i brought this really cheap gravel vaccum on ebay for about $2.26 with free shipping. I thought it would suck, but it works perfectly! not too strong for my 5gal and not too weak for my 10g. it even has a pump at the end to get the suction started!
So if anyone else is looking to buy one, and is willing to wait for the shipping time (it takes like 2 weeks cause its from hong kong), and want to save a few bucks! go there!
I thought i should pass on this bit of info =< i mean petco ones are only about 10 bucks, but 8 dollar saved is 8 dollar more on plants for my bettas! =D