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new_world_disor
02/24/2008, 04:31 PM
well the last few days ive put one of my old 54w PC lights over my 75g ( along with the 2 T8's it came with ) this has caused tank temp to rise about 1*c over the time the lights are on. anyways. i am a little worried that when i have the 2 x 250w mh over the tank. its going to going insanly hot and cause a problem ( a big one )...Is the only option to get a chiller ? run pipes all over the place, more money, and frankly. theres no space for it in the stand... or anywhere near it . :(

any ideas on how i can cool things down ??

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hubris007
02/24/2008, 04:35 PM
fans blowing across the surface of the water or across the lights (ballasts especially) can greatly lower your heat.

If you blow across the water, you will need to replace more water weekly, due to evaporation, but this is a very good way to reduce heat.

auntynatal
02/24/2008, 04:37 PM
move your heater down 0.5 of a degree and it should even out? well thats what I would do!

Aquarist007
02/24/2008, 04:40 PM
<a href=showthread.php?s=&postid=11930941#post11930941 target=_blank>Originally posted</a> by new_world_disor
well the last few days ive put one of my old 54w PC lights over my 75g ( along with the 2 T8's it came with ) this has caused tank temp to rise about 1*c over the time the lights are on. anyways. i am a little worried that when i have the 2 x 250w mh over the tank. its going to going insanly hot and cause a problem ( a big one )...Is the only option to get a chiller ? run pipes all over the place, more money, and frankly. theres no space for it in the stand... or anywhere near it . :(

any ideas on how i can cool things down ??

ad

that is alot of light over a 75 gal--is it a high tank.
You may want to downgrade to 175 watts or just one 250 watts MH

new_world_disor
02/24/2008, 05:06 PM
i was origionally going to go with 1 x 150 or a 250 with actinics. but i want to keep mainly sps and lps. the tank is 25.5" deep. and everyone said that a 150 wouldnt cut it . and i should get 2 x 250 or id get some really dark spots. i thought this would be a lot as the tanks only 33.5" accross

as for lowering the heater a degree. its on a heater controle computer. so it only heats the water when it drops bellow 25.5*c. so it would make a difference

Aquarist007
02/24/2008, 05:40 PM
I was told the same thing--that 150 watt halides would not cut it in a 28 inch high tank. I just built the reef high and the sps are up there where there is a ton of flow. The lps that like less flow and less light are near the bottom.
this is what you also have to consider other then heat--coral husbandry--alot of lps and softies to not want to be blasted with full force halides. the twin 150 watts max out at 18 inches--I imagine you will be hitting the substrate pretty hard with duel 250 watts

new_world_disor
02/25/2008, 07:49 AM
would dual 150's cut it then ?? ( thanx for the input :D )

new_world_disor
02/25/2008, 08:07 AM
if dual 150 would work. i think ill go for this unit :
http://www.firststopaquatics.co.uk/acatalog/Arcadia_Classica_Pendant_.html

its 880mm my tank is 850mm so it would overhang my a few cm either end. but it should be ok... or would the light spill out either end ??

Aquarist007
02/25/2008, 08:09 AM
<a href=showthread.php?s=&postid=11935670#post11935670 target=_blank>Originally posted</a> by new_world_disor
would dual 150's cut it then ?? ( thanx for the input :D )

put it this way they worked for me--and you know with these the max penetration will be 18 inches--giving you lots of light for sps on the top of the reef and lower light near the bottom.
My coralife fixture is under a wooden canopy. I drilled two 4 inch holes on the top of it and added two external fans
Over the course of 10 hrs the temp rises almost a degree--that's all.

new_world_disor
02/25/2008, 08:14 AM
gd stuff :P thanx for the help. has been a great help. so many ppl say different things ( and to be fair. i dnt trust my LFS ) haha

Aquarist007
02/25/2008, 08:33 AM
thanks glad to help

hyperfocal
02/25/2008, 08:45 AM
Just something else to consider: If you go with the 250W MH, you can select a lower PAR bulb that's more aesthetically attractive and still get good coral growth.

new_world_disor
02/25/2008, 08:53 AM
if i go for the twin 150's it comes with 14k bulbs :)

OneReef
02/25/2008, 09:33 AM
I debated for weeks on the same topic, whether to get 150's or 250's over my new 75g. I ended up going with the 250's for 2 reasons. One, I wanted to go with the 14K's which will have less par, and two, my tank is 21 3/4 inch deep, and also, the way my canopy is, the lights will be 10-12" off the water. I did not want concerns in the future over what I could keep or not, so I went with the 250 based off my distance to the water, depth of tank, and bulb color. I installed a fan on each end of my canopy, one pulling and one pushing. I hope I don't run into any temp problems when I get it going, but that was the decision I made and why.

new_world_disor
02/25/2008, 10:03 AM
im going to go with the twin 150's for now, the pendant will hang around 2-3" above the water.. is this too low ?. and if i have to change it . it means ill have lights to start another smaller tank :P haha

new_world_disor
02/25/2008, 10:24 AM
as for lights heating up water a lot. i left my 54w PC off today. and the temp hasnt gone above 25.9*c lol

Aquarist007
02/25/2008, 01:33 PM
<a href=showthread.php?s=&postid=11936560#post11936560 target=_blank>Originally posted</a> by new_world_disor
im going to go with the twin 150's for now, the pendant will hang around 2-3" above the water.. is this too low ?. and if i have to change it . it means ill have lights to start another smaller tank :P haha

Do the lights have a clear cover-that low to the surface and with the agitation the surface has you are going to get a lot of salt creep. Mine is ok at 6 inches.
Are you just running halides or supplementing them with attinics?

Aquarist007
02/25/2008, 01:49 PM
<a href=showthread.php?s=&postid=11936713#post11936713 target=_blank>Originally posted</a> by new_world_disor
as for lights heating up water a lot. i left my 54w PC off today. and the temp hasnt gone above 25.9*c lol

BTW there is nothing harmfull in a temp fluctuation a few degrees either way of your norm. Its all in how you condition your fish and corals to accept the change.

new_world_disor
02/25/2008, 04:33 PM
yeh they have a glass ( i asume its glass ) cover over the lamps. for now im going to stick with just MH, i was worried about crapy colour. but one of my LFS has a deries 4 pendant with twin 150's and looks really good : (pic)
http://i96.photobucket.com/albums/l179/new_world_disorder/IMAGE_257.jpg
but if it looks crappy on my tank. ill build a hood and mount the unit alongside 2 actinics :) ive got my heater controler set to ( panic mode ) BEEP when it goes +/- 2*c

new_world_disor
03/08/2008, 07:10 PM
well my mum decided to get me an arcadia series 4. 250w mh + actinics... here friday :)

Aquarist007
03/08/2008, 09:11 PM
flow will also help with heat dissipation
the flow in your tank should be between 20-40 times tank turnover in gph.
the surface of your water should be really churning