Victor Martinez wrote:

www.ericschreiber.com/aquarium/tank1.html

That is very cool! How do you prevent water from touching the add-on
lights?

I don't know if you're familiar with the Eclipse hoods or not, but
perhaps you can see from my photos that there is a filter area at the
back. You might be able to make out the two metal hooks I have hanging
from this filter area, into the 'gap' in the Eclipse hood design.
Resting on those two hooks I have a piece of Plexiglass, cut to just a
bit larger than the size of the add-on lighting fixture. The lighting
fixture then rests of the Plexiglass.

It isn't by any means moisture-proof, and no way would it pass a UL
inspection. :-) But, the Eclipse hoods don't make much splashing, and
as long as I'm careful when working in the tank, the fixture stays
pretty well dry. Because of the way it's all jammed in, and the shape I
made the hooks in, it's actually pretty sturdy. I'd really have to
wollop it to knock the add-on fixture into my tank.

I'm surprised that no one makes a commercial add-on similar to this. It
shouldn't be hard to manufacture a reasonably well sealed fixture with
a better hooking system that people could just drop in place.

Here is some truly awful ascii-art that shows the shape of the hook.
This will only work if you're using a fixed font, like Courier, to view
it. The left side hangs into the filter area, and the right side drops
into the gap to support the Plexiglass. Notice the upturn at the far
right, which serves to keep the Plexiglass and fixture from falling off
the hook. While I made this with a pair of thick, stiff wires, someone
with some skill in heating and bending Plexiglass or acrylic could made
a continuous form that served as both hook and splash guard.
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--
Eric Schreiber
www.ericschreiber.com