fishface, nope I'm a guy (see my profile
)
I like those 2.5 mini-bows too Amy. Lots of space for a betta.
fishlover25, I do weekly water changes, about 25% of the tank volume. During the changes, I turn off the airpump that powers the UFG, and I use a small gravel vacume/siphon to suck-up the water and dig-into the gravel ontop of the debris. It does a pretty good job at pulling out the waste ontop of the UGF. Then I re-fill the tank and turn the airpump back on. The water does get a bit murky for about an hour after from some of the floating debris, but it clears up pretty quick.
If I do a water change and it stays cloudy, I will do a full tank clean. I remove the fish and put it in a bowl with his old water, I remove all the tank decorations, then I pour out all the old tank water and gravel into a clean pail. I remove the UGF system and rinse it off using clean tap water, then let it dry. I rinse the tank decorations off and clean the inside of tank the tank with a tap water/vinegar mix. I wipe everything dry with paper towel, then put the UGF back in.
The bio-filter bacteria lives mostly in the gravel in an UGF system, so I rinse the debris from the old gravel using the old tank water and put it into the tank. I then add new water (I always have a bucket of new water aged overnight so that it is the same temperature as the tank water), then I move the fish back in.
Its really not all that different than a top-filtered tank. Any tank will get a lot of debris in the botton that will accumulate over time. In smaller tanks like I have, it has a much bigger affect on the water quality than say a 55gal tank.