I've used them for over a year now, no problems so far. To me the biggest
concern was the unknown risk of sealing the connections so to not hurt the
fish. Overdid it the first time trying to make sure not water got to the
connections, really only requires a thin coating obtain "waterproofness" man
is that a bad word or what. The biggest hassle is keeping them from
floating up and keeping them in the correct position, "the right angle".
But with a little creativity with a flower pot and some rocks and be sure to
run the cord the bottom of the pot and it seems to work well.