Marine Lighting in a FW Tank
I recently set up another 47 Gallon Cube aquarium. It too contains native species with java moss as a live plant and a few platic plants. I had an extra light fixture and decided to use it on this tank. It is a 50/50 daylight and actinic florescent light. I'm not a lighting expert.
Will this be ok for the FW setup? Is it too bright for most fish? I would be very interested in your expert opnions.
The 50/50 daylight bulb can be used just fine for a freshwater tank, but I would get rid of the actinic. It is a matter of spectrum, and especially with something like java moss which doesn't do well with extreme amounts of lighting.
The lighting shouldn't bother your fish unless it is causing temp fluctuations, which actinic can also do.
So, in summary, 50/50 ok, actinic save for saltwater.
The spectrum you want for your tanks is 6700k-10000k for freshwater plant growth. While there are certain instances of actinic benefiting freshwater plants, it's far out of the range of what you are growing, and is basically a waste of energy (as the light will not benefit plant growth). It's in the blue end of the light spectrum, which is good for coral, but plants grow using mostly red and green light. I'd recommend replacing the actinic bulb with one rated 6700k-10000k.
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