I just got a new Finnex Ray for my 55 low tech setup. The directions say to only use it with a covered tank. Is that really necessary? I have glass over the top, but on my other tank I don't have any cover at all (but a different light fixture). It mounts well to the sides of the tank. Does anyone use it without a covered tank?
Do be careful about keeping up with evaporation. If you let it get down a bit lower than it should and you filter outflows start generating a little bit of spray(mind you I'm talking about a drop of water here or there being cast into the air) it will penetrate the fixture and burn it out. I ended up having to send mine back for a new ballast and led strip. I'm thinking of running a bead of silicone along the splash guard seam to reduce the chance of this in the future. If I need to take the splash guard out I would just have to take a razor and slice the silicone away and reapply it when I'm done.