I use the Penguin 100 Bio-wheel filter.
On another thread, someone suggested I use the plastic from a water (pepsi) bottle to divert the current. It seems it would work well, but I haven't personally executed it yet. I only have one male in my 29 gallon, and he hasn't stayed away from it, and I am still a bit concerned about reducing the effectiveness of the filter by changing the output (basically re-routing it to the pickup tube).
I can tell you that my local PetSmart has a female betta tank setup in the wall, with that strong current, and the females always appear to do just fine, some even seem to enjoy swimming in the current.
I had this same filter on a 10 gallon, both with just the male and with it divided in three and a female. It moved her, but she also seemed to like it a bit, but never figured out why. I did use a net with a sponge in it to slow it down a bit at that time, and currently have two nets on the end of it slowing the current a bit.
I would say if you are deeply concerned, the plastic from a 20 oz does look like it works wonders from the pictures. Here is the link that was given to me:
http
/www.fishforums.net/content/forum/84...thod-Ive-found/
Enjoy your sorority!
