Some bottles will grow more brightly than others so if you re after the glow take a pen sized black light with you to the store.
Fish that glow under black light.
They are also quite striking under black light in a completely darkened room.
The fish appear bright under normal white light and fluoresce brilliantly under a blue light.
Many living corals produce uv protective pigments that will fluoresce under uv light as well.
Normal fish aren t bothered by blue light or even black light that much but won t really be seen in an aquarium with just uv.
The way the glofish company produces their fish is by inserting genes that encode for certain fluorescent proteins green red purple etc.
A color is only fluorescent if it s able to absorb light at the right wavelength.
Unfortunately black lights produce too much harmful uv rays to be used.
Ideally the fish s coloring should be capable of absorbing long wave uv or black light.
The benefit is that uv light tends to cause some materials to fluoresce.
You ll see the glow in both regular and diet tonic water.
Today there are 12 lines species and color combination of glofish including tetras zebra fish and barbs in such colors as electric green moonrise pink and cosmic blue.
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