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#1
04-12-2006, 07:36 PM
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re temperature
do u have a lid on your tank?
If so, I would think that is the major cause of your heating problem. I think that the lid would act like a magnifying glass under the MHs... I dunno..but just my opinion.
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP 
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#2
04-12-2006, 07:39 PM
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with 400 watt lights you are probably going to have to invest in a chiller.
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Given sufficient thrust pigs will fly just fine. 90 Gallon LPS tank - Challice, Acans, Favia, Diplo and Zoos 125 Gallon SPS Coming Soon!
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#4
04-12-2006, 07:53 PM
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I have dual 400W halides, and have an enclose canopy. I also have glass covering my tank. Two 12V fans running while the lights are on prevent them from raising the tank's temp even a degree. I would consider trying this if you can. I think the enclose canopy and only fan openings allows more efficient air circulation for providing fresh/cool air and getting the heat out.
Chris Edit: I also have no sump, I have a 100gph flow 23g refugium above the tank(sitting directly over the lights too) that needs to be heated during the day sometimes to maintain a proper temperature.
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No more tanks  - Laying off the ReefCrack for awhile!Cheers, Chris
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#5
04-12-2006, 09:17 PM
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Definately install some fans right into your hood. You can do a few configurations, like one blowing in, on blowing out, or 1 or two blowing across to a vent in the other side.
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#6
04-13-2006, 12:10 AM
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Heat from the lights is going to heat the surrounding air, but not the water so much directly. Blowing fans at the lights will distribute this heat into the airspace surrounding the tank, but I don't think it will be too effective at actually cooling the tank. Eventually, if all the air surrounding the tank/sump gets beyond the tank temperature, it will start to heat the tank, though.
...unless you've got a really closed-in light canopy that traps a bunch of hot air directly above the tank, then this effect could be greater. I think the bigger effect is the energy of the light hitting the rocks heats up the rocks which then heats the water. If fans on the water surface won't do it you are going to be really pressed to avoid some sort of water chilling.
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#7
04-13-2006, 03:36 AM
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I run a couple of 400w(and a couple of VHO antics) with a couple of hood fans and my canopy is fairly open (no glass on top of tank) and I still struggled with temp increase, 2- 3 deg by end of day, so ended up putting a small house fan over my sump - all set up with timers. Seems to be doing the job so far.
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Mike 150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made. Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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