Hi there, I just got a 20 Gallon tank and it came with a power filter and a heater. I was doing some searching and I found that there exists submersible internal filters as well. Are these any good? Which are better? The model I am looking at is the Hydor EKIP 350 Thermofilter 100W 125 GPH. Info at
http://www.aquariumguys.com/hydorekip1.html
Please let me know what is best, keep the old, or get the new. Also, what are the benefits?
Thanks,
Greg