You may want to do a nano-refugium...
http

/theaquariumkits.info/detail/p_B005VFLAG2/Top-deal-HB-210--Finnex-External-HOB-Refugium---Breeder-Box--Air-Pump-onsale.html
I started mine as kind of an experiment and quickly got some more sophisticated ones for all my tanks!
http

/www.thereeftank.com/forums/f20/fs-midnight-sun-large-hob-refugium-131986.html
Most of people use them for Saltwater systems, but it works well with Freshwater as well.
Because I live near the beach I have a sand bed and dried coral rock rubble in mine (the dried coral because it's poreus and gives more surface area for beneficial bacteria to colonize) I also put Java moss to suck the nitrates out of the water, and a Japanese trap door snail to munch the Alge (Alge growing in the refugium sucks the nutrients out of the water and actually PREVENTS it from growing in the main tank!) then I added a culture of Daphnia (to eat the bacteria), Scuds (to eat the detritus) and FW shrimp... The coolest thing is that NOT ONLY do the little ecosystem of "cleaning crew" help stabilize the water, but small numbers of them find their way back into the main tank and provide live food for the fish! (also they encourage the fish to hunt for them, keeping them active and healthy instead of lazy and bored) I got the idea from the sea horse and Mandarin fish people who use them to keep a steady supply of live food for the fish to hunt.
It's been the coolest and most productive little experiment, my fry have grown faster, my tanks water peramaters maintain better and last longer, and the little colonies in the refugiums are just as fun to watch as the main tanks! Basically win-win it's two tanks in one and each helps the other.