Question re: back of tank - keep glass clean or not?

[StirCrazy]

A lot of people seam to think that you will get a benifit of reflected light, the actual usable light that is reflected is not a significant amount. take into concideration on a smooth reflective surface the light is reflected at the incident angle of what it is recived, so 90% of refleced light will hit the bottom a few inches from the glass and closer. also glass is not a 100% reflective surface by any means its transmittance can be between 85 to 95% for common glass so that means 85 to 95% of the light passes right through the glass to start with, the remaining 5 to 15% is reflected. plus the light that is reflected travels a greator distance through the water so its intensity is dropped also.

so don't clean your glass just because you think you are going to get more light.

now if you made the back of the tank out of a highly reflective material with a very low transmittance it might be a differant story, but I don't know anyone making tank backs out of spectral aluminum

Steve

[fkshiu]

I keep the back sparkling clean. Looks much better giving a far greater sense of depth to the tank.

Coralline is fugly. I hate the look and the fact that it sucks Ca/Alk.

[Skimmerking]

Originally Posted by StirCrazy

A lot of people seam to think that you will get a benifit of reflected light, the actual usable light that is reflected is not a significant amount. take into concideration on a smooth reflective surface the light is reflected at the incident angle of what it is recived, so 90% of refleced light will hit the bottom a few inches from the glass and closer. also glass is not a 100% reflective surface by any means its transmittance can be between 85 to 95% for common glass so that means 85 to 95% of the light passes right through the glass to start with, the remaining 5 to 15% is reflected. plus the light that is reflected travels a greator distance through the water so its intensity is dropped also.

so don't clean your glass just because you think you are going to get more light.

now if you made the back of the tank out of a highly reflective material with a very low transmittance it might be a differant story, but I don't know anyone making tank backs out of spectral aluminum

Steve

Ok Steve let me rephrase that the tank is alot brighter from the dull coraline to the bright light blue color that the tank is painted..

[StirCrazy]

Originally Posted by asmodeus

Ok Steve let me rephrase that the tank is alot brighter from the dull coraline to the bright light blue color that the tank is painted..

after having both a tank that was viewable from 3 sides and one that was against the wall at the same time to compare, I would never have the back clear/clean again. I actualy fine the pinks, reds and purples of the coraline catch the light better and light up, where the glass just stays looking dim. now having said that I would lightly clean the back to allow the coaline to take hold, so in other words to remove the film algae but not hard enough to remove the coraline.

It does take a while to get the look this way so you would want to paint the back of the tank also. I did blue befor but I would go black if I did it again.

now a painted back does look nice and as you said looks bright also, but it doesn't look that natural to me. both my tanks had one end or back painted and I use a medium blue. it was like a wall of blue no depth, no variation ect.. how many things in the ocean are like that. when the coraline grew over the back of the one tank it was amazing instead of nice, the rockwork blended into the back and added a dimention to the tank the other didn't have.

Steve

[Norstar]

I keep the front and sides clean. I like the natural look.

[tang204]

i also like the natural look of the coraline, gives a tank character