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My betta, Bozley, is very active, so it really broke my heart to see him struggling in the current the filter would create. So I did a quick google search for "filter baffle" and stumbled upon what I consider the easiest DIY project I've ever seen!

http://www.aquariumforum.com/f34/filter-baffle-8822.html

Now there is no excuse for people to avoid filters because they "create too much current"!! Yay for happy bettas!!!

I did that for my HMRT boys. =D They absolutely love it. It doesn't look pretty, by any means, but it works. Occasionally Corsair will be a dummy and go swim in the diverted current and get pushed into the divider, but for the most part, he avoids it.

Every time I get a funny look at work from telling people they can put a betta in a bigger tank with a filter, or people fret about the current from some of the filters on their fish or aquatic turtle, I tell 'em to look into baffling. There's no excuse at all to not have a filter for anything that doesn't like a current. :3