We know cobra lilies like two things:
- cool water on the roots
- moving, aerated water on the roots (the most important I think)
So I had some cobras I was taking out of dormancy, and I had an old 2.5 gallon aquarium lying around with some grungy old filters, and figured I'd try something.
I used another filter's intake extenders on this filter in order to get its intake to touch the bottom of the aquarium. The water level is about halfway up the sphagnum.
For those who aren't familiar with aquarium filters, this filter sucks water from the bottom of the tank and pours that water down from the top (normally there would be some kind of foam for filtration but all it would do in this case is slow the water down).
If I felt like trying the ice cube method I could drop ice cubes into the filter and they'd melt on their own time, cooling the falling water as they did, but I don't think it'll be necessary.
An even faster filter would have been nice, but this is what I had that wasn't being used. We'll see what happens.