You can try this method I posted on fixing your filters flow.
Under gravel with reverse flow works great. If your going sand under gravel will not work.
You can try this filter. [ame=http://www.amazon.com/Aquarium-Internal-Filter-45gph-adjustable/dp/B00176GKM8/ref=sr_1_11?ie=UTF8&qid=1348290320&sr=8-11&keywords=filter+aquarium]Amazon.com: TOM Aquarium Mini Internal Filter 45gph adjustable flow: Pet Supplies[/ame]
Its really small you can control the flow and you can swap between a directional output to a spray bar.
This one is ok too if remove the filter media and put in some sponges. Flow is also adjustable.
[ame="http://www.amazon.com/Hagen-A285-Marina-Power-Filter/dp/B0032G8TPW/ref=sr_1_1?ie=UTF8&qid=1348290405&sr=8-1&keywords=Marina+s10"]Amazon.com: Marina S10 Power Filter: Pet Supplies[/ame]
Cheap sponge filter you can try with 2 foam pieces
[ame=http://www.amazon.com/Aquarium-Biochemical-Sponge-Filter-Fish/dp/B0056XVF82/ref=sr_1_4?ie=UTF8&qid=1348290508&sr=8-4&keywords=sponge+aquarium+filter]Amazon.com: Aquarium Biochemical Sponge Filter Fish Tank Air Pump: Pet Supplies[/ame]