12-25-2006, 07:11 PM
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I was using a tetra reptofilter for a while. It's adequate for a 10 gallon tank. Attaches to the glass with suction cups. Draws water in through slots in the bottom inch and a half of the filter, and dumps it out through a spout about 6" from the bottom of the filter. If you can find a rock the right size, it makes a good waterfall. The other internal I have used is a duetto 50. Nice little critter. Between that and the repto filter, it kept a 20 gallon tank with a 2" turtle clean for a week at a time between cleanings. The duetto is smaller, has a little venturi attachment you can use to pull air into it if it's fully submerged. It has a rotating outflow, so the current can be better directed into a curent killing arrangement (or to enhance the current). Also, the repto filter has to be straight up and down. The Duetto can be in any position so long as the inlet is underwater.
Word of warning on using HOBs for waterfalls - I've tried it, and it doesn't work all that well. The impellers aren't designed to raise water more than a couple of inches - just over the lip of the tank. The outflow tends to pulse when the water level is lower than an inch or two below the top of the tank, and can really tail off below 3 or 4". If you want to do a waterfall, get a cannister filter or some other sort of pumping arrangement that's designed to lift water a couple of feet rather than a couple of inches.