Deleted User 6 Posted February 16, 2009 Share Posted February 16, 2009 I'm building my canopy for my 70w MH. The sand line to top of the water line is 12". How far from the water does the MH need to be? Thanks! Link to comment
Mr. Fosi Posted February 16, 2009 Share Posted February 16, 2009 As close as you can get it and be safe. If you have livestock, be sure to acclimate them to the light before settling on how close to have it. Link to comment
Grendel0501 Posted February 16, 2009 Share Posted February 16, 2009 I raise mine about 8" off the water , so that my single halide spreads more across the 45g tank. The closer it is to the water , the more I think heat will become a issue. Link to comment
Mr. Fosi Posted February 16, 2009 Share Posted February 16, 2009 The closer it is to the water , the more I think heat will become a issue. Good point, but in the end it's a trade-off. Link to comment
Deleted User 6 Posted February 16, 2009 Author Share Posted February 16, 2009 Good point, but in the end it's a trade-off. Heat's definitely going to be an issue - I do plan to keep a clam in about a year or so on the sand bed. Does that mean it needs to be really close to the water? Link to comment
reefer123 Posted February 16, 2009 Share Posted February 16, 2009 how is it a tradeoff? wut do u get that is better by placeing it closer to the water?? mine is bout 8 inches offa 8-9 inches offa the water. Link to comment
Mr. Fosi Posted February 16, 2009 Share Posted February 16, 2009 Depends on the clam, how much you plan to feed and how clear your water will be (including color, not just cloudiness). I wouldn't go more than 6" off the water and I would plan to have a fan (or two) to blow air through the canopy. It will increase evap, but it will keep your heat issues to a minimum. Link to comment
Grendel0501 Posted February 16, 2009 Share Posted February 16, 2009 how is it a tradeoff? wut do u get that is better by placeing it closer to the water?? mine is bout 8 inches offa 8-9 inches offa the water. I would think greater intensity. Maybe you loose some intensity over the 8" space between the tank. Not sure how much though , or if it would even be noticable , since the light is traveling through air and not water. Link to comment
Mr. Fosi Posted February 16, 2009 Share Posted February 16, 2009 how is it a tradeoff? wut do u get that is better by placeing it closer to the water?? You get more light into the tank because less misses it and you get more light to the bottom of the tank because you have less attenuation. Light exponentially decreases in intensity as you move away from the source. You can reduce the exponent by using a good reflector, but you can't mitigate it altogether. Link to comment
reefer123 Posted February 21, 2009 Share Posted February 21, 2009 ooo thanks mr.fosi! my dad went to usc too! Link to comment
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