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No mine has a cover, it has weather loaches which tend to fly so I would never leave the cover off. ;)
 
Not sure yet, probably a holder because the tank is far from the ceiling.
 
I opted for the T5 version of that setup. I fit 2 strips in a rain gutter caped off the ends and set it on top of the tank. Looks like it was made to be that way. HO T5 bulbs can be had at 54 wats per bulb.
 
Ditto. I went with the 22" version with coralife T5 HO's. The whole thing fit right into my standard All Glass hood. Worked great. I plan on doing this some more in the future. I'd say the only thing missing is good reflectors. But there has to be a way.
 
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