I just wanted to say recommend an article by Rick Hess on Goldfish Connection entitled "The Ultimate Intake Tube":
Ultimate Intake Tube
I made one up today and installed it in my 29 gallon tank..the difference is AMAZING! Ever since I have had my tanks I have never been able to get intake tubes for my HOB filters that reached to the bottom of the tank and all the gunk that builds up because the filter cant get to it..
All you need is a piece of PVC pipe (I used 1" although the article says 2" which is MASSIVE) and drilled four rows of 5 holes each like it says in the article, then fitted it over the intake tube. I had just cleaned off some gunk that had build up on my bubble wand and it was all floating around in the water, 2 minutes later it had ALL GONE.. Such a clever idea! Thanks Rick!
PS. My apologies if someone has already posted this ingenious idea somewhere on the forum..