<a href=showthread.php?s=&postid=#post target=_blank>Originally posted</a> by racermike27
I have used the Tunze 6025 and I do not recommend them.
I have had numerous problems with mine since the day I got them.
The propellor would jam and get stuck. It wold also be running and then just stop suddenly. Then the motor inside would get hot and heat up the tank water. I tried cleaning it reassemlbing teh unit etc.. no luck. Also the magnets that hold them on are strong but the mounting for the base is fairly weak. If you bump them they will fall off of the magnet quite easily.
I would say go with the Koralia if you are on a budget. I have seen these and would now take those over the nanostreams.
Just my 0.02 cents
Good luck,
Mike