Please visit our Sponsors
FAQs about Coral et al. Cnidarians System Lighting: Nighttime

Related Articles: Coral Lighting: what we know and what we don't know (mostly the latter) by Sara Mavinkurve
Lighting Reef Systems: Considerations, Organisms, Goals and Costs by Bob Fenner Light/Lighting For Marine Systems, Coral Feeding, LPS Corals, True or Stony Corals, Order Scleractinia, Propagation for Marine Aquarium Use

Related FAQs: Coral Lighting 1, Coral Lighting 2, Coral Lighting 3, Coral Lighting 4, & FAQs on Coral Lighting: Science/Application, Designs/Fixtures, Lamps/Bulbs, Quality, Duration & Intensity, Troubleshooting/Fixing, Makes/Models/Manufacturers, & Lighting Marine Inverts 1, Lighting Marine Inverts 2, Lighting Marine Inverts 3, Lighting Marine Inverts 4, Lighting Marine Inverts 5, Lighting Marine Inverts 6, & LR Lighting, Fluorescent Light 1, Actinic Lighting, Compact Fluorescents, Metal Halide Lighting, Lighting Marine Invertebrates Growing Reef CoralsStony Coral IdentificationStony Coral Behavior,

Some light is useful 24/7... greatly discounts anomalous losses during the dark. It's never pitch black underwater

Whether or not to moonlight?...      12/4/19
Hi Gang,
<Hey Chuck, howsit?>
I run a 220 gallon mixed reef (LPS and some SPS) with a fair number of fish... plus a 60 gallon seaweed/macroalgae display tank on a common sump.
The only inhabitants of the 60 are a copper banded butterfly that I've had for a few years
<Wow!...a hard species to keep for extended periods of time>
(I was never successful at keeping one in a 'community' tank due to their lack timidity at feeding time) plus a Coris wrasse, who only emerges from the DSB ever few days, when he's hungry.
<The wrasse needs more room than this>
Would either of these tanks likely benefit -- or suffer -- from having some blue LED moonlight shining down?
<Neither... just remember that marine critters are accustomed to get light from the top/surface.>
I bought a little (supposedly) submersible unit...
but the instructions are in Chinese (literally) and it looks like it's really best suited for a top-of-the-tank mounting. In any event, the cord between the don't-dunk-this-part electronics and the sealed LED unit isn't all that long. Not sure it would reach the bottom of my tank. My regular tank lighting doesn't offer a practical moonlight solution.
<If space on your current lighting fixture allows it, place it there too...
I would; otherwise place it as close to the top as possible.>
Thanks in advance for any help on this...
<Most welcome. Wil.>

Corals In The Moonlight! Hello there, Could you please advise me on whether it is a good idea to leave a blue light, (marine Glo), on at night. I have left mine on for five months now, and the difference in the corals is amazing. There is plenty of cover for the fish. <I don't see the harm in this at all. Think about it- on the reefs, there is always some ambient light form the moon (except on moonless nights), and there are many interesting aspects to coral spawning, plankton upwelling, fish breeding, etc. that seem to be tied to lunar cycles. You may even want to try running the lights and/or diffusing them on a schedule that corresponds to lunar phases...could be interesting to see what happens. Good luck! regards, Scott F.>

Small Marine Aquariums
Book 1: Invertebrates, Algae
New Print and eBook on Amazon:
by Robert (Bob) Fenner
Small Marine Aquariums
ook 2: Fishes
New Print and eBook on Amazon: by Robert (Bob) Fenner
Small Marine Aquariums Book 3: Systems
New Print and eBook on Amazon:
by Robert (Bob) Fenner
Become a Sponsor Features:
Daily FAQs FW Daily FAQs SW Pix of the Day FW Pix of the Day New On WWM
Helpful Links Hobbyist Forum Calendars Admin Index Cover Images
Featured Sponsors: