Another question: I have a plastic lid that came with the tank kit. The Finnex seems to mount on the sides without a lid since it's raised a bit. Should I switch to a glass top and just let it shine through the glass instead? Does condensation affect the light if I velcro it to the inside of the current lid? I don't want to risk Red jumping out, he's never done it but I know they're jumpers.
You'll want to go with a glass canopy. I'll have to double check if the Marineland or the Versa fits the Top Fin 5.5.
You don't want to mount those lights where they will be subject to humidity, while they are sealed from below with a glass strip, I will tell you that moisture will get into the light and moisture damage is not covered under the warranty.