UV Light Good/Bad
 

Hello I'm a new member, (sounds like AA) i have a question to pose to the reefer community: Is Ultra Violet light beneficial to my tank? Here is my rational behind the question:

1) Silica Glass (most glass) does not transmit UV light (or very little), hence you cannot get a suntan indoors.

2) the amount of UV light at the equator, most coral reefs, is about 1000X higher than at the north pole (the south pole has a man made ozone layer hole)

3) My Maxspect G2 LED's produce a focused yet wide array of light wavelengths that include the UV -A,B,C as well as visible.

4) If i take my glass lid off the tank it will evaporate more and i risk losing fish to Tank Jump Suicide.

So fellow reefers what should i do? take the cover off and give full reign to my overpriced LED's or continue down this path of salt creep and a UVless tank?

PS Dont buy G2's they have no controller or dimmer, I thought in this day and age that would be standard, apparently not in China. :cry:

I use a DIY screen top to stop fish from jumping. I also like an open top for the gas exchange.

... i removed my glass top. thanks :lol:

i voted both yes and no.... if i am using a canopy then no... no canopy then yes usually with the exvception of in the summer as it restricts evap and the temp gets too high...

glass top
 

i built a canopy&my vertex hangs 12 " above the water

No glass top on the tank but glass shields on my MH fixtures.

Interesting thought. The G2 has acrylic glass the best i can tell. Acrylic will transmit down to 300nm so thats some UV. You would think lighting manufacturers would consider this stuff...

I don't know if this will help, I have a glass shield on my 400w mh with a glass top. last month I decided to take my glass top off so I don't have to clean my glass top all the time.(I am not lazy just try to make things easier :redface:) I had the glass off for about three days and all of sudden 5 of my acros started to bleach. Now I am not sure if its due to the sudden change in light intensity and excess uv shinning down but I immediately replaced my glass top, 2 weeks later 3 of the 5 recovered and the other 2 is now in the garbage. I don't believe that coral needs uv to grow but it can definitly with stand it and flourish either way. What I am trying to say is take it slow, raise your light and let your coral get use to it and not just remove it like I did. best of luck let me know how it turns out. :smile:

A sudden increase in UV rays can cause your corals to bleach. That's why they need to be acclimated to your tank by starting them off in lower areas and slowly moving them up.
Depends on the conditions they came from.

I'm using Lexan lids on my tank, but that's mainly to decrease the amount of evaporation.

I don't recommend a glass top, the tank does better when it can "breathe"