heat problems

phishy2 · 02/24/2006, 05:34 PM

I have a 250W MH pendant hanging over my 37gal tank (30x12x24) and the tank has been reaching 86-88 degrees by the end of the day... i have the light only coming on 7 hrs a day now, and raised it from 8inches to 12inches i also added a fan blowing over the heat zone of the light. the tank now is at a steady 82degrees throughout the day, and about 80 at night.

my questions are:

How can i get the temperature lower (around 78 during the day) without a chiller?
Is the light too high above the tank? If not can i raise it more? i plan on keeping some high intensity corals/anenome.

I aslo have 4 powerheads in the tank... 2 for flow 1 for refugium and one for the skimmer. 3 of which are MJ1200's do they produce alot of heat?

thanks for any help.

Don Berry · 02/24/2006, 05:42 PM

Where do you have your heater set at? Why not set your heater at 78, so your tank will only go up to 80 when the halides are on. Do you have good surface aggitation. I have my halides 8 inches from the water and run 2x250w on a 72. I only have one small fan running and my temp stays a steady 78.5. It goes up a degree or so in the summer.

phishy2 · 02/24/2006, 05:52 PM

i do have the heater set to 78, the problem is it doesnt get down to 78... at least that i know of when i am awake. like i said i have 2 maxijet 1200s for water movement, the surface does get alot of agitation.

i forgot to mention i live in florida and it gets hot out, but the house is usually around 75 all the time...

jmann762000 · 02/25/2006, 09:40 PM

do you have a sump? If so,as wierd as it may sound, buy a little clip on fan and clip it to the sump so it blows on the water in the sump. It should bring it down a few degrees.

02/24/2006, 05:34 PM	#1
phishy2 Registered Member Join Date: Sep 2005 Location: Florida Posts: 190	heat problems I have a 250W MH pendant hanging over my 37gal tank (30x12x24) and the tank has been reaching 86-88 degrees by the end of the day... i have the light only coming on 7 hrs a day now, and raised it from 8inches to 12inches i also added a fan blowing over the heat zone of the light. the tank now is at a steady 82degrees throughout the day, and about 80 at night. my questions are: How can i get the temperature lower (around 78 during the day) without a chiller? Is the light too high above the tank? If not can i raise it more? i plan on keeping some high intensity corals/anenome. I aslo have 4 powerheads in the tank... 2 for flow 1 for refugium and one for the skimmer. 3 of which are MJ1200's do they produce alot of heat? thanks for any help.

02/24/2006, 05:42 PM	#2
Don Berry Registered Member Join Date: May 2004 Location: Oswego, IL Posts: 950	Where do you have your heater set at? Why not set your heater at 78, so your tank will only go up to 80 when the halides are on. Do you have good surface aggitation. I have my halides 8 inches from the water and run 2x250w on a 72. I only have one small fan running and my temp stays a steady 78.5. It goes up a degree or so in the summer.

02/24/2006, 05:52 PM	#3
phishy2 Registered Member Join Date: Sep 2005 Location: Florida Posts: 190	i do have the heater set to 78, the problem is it doesnt get down to 78... at least that i know of when i am awake. like i said i have 2 maxijet 1200s for water movement, the surface does get alot of agitation. i forgot to mention i live in florida and it gets hot out, but the house is usually around 75 all the time...

02/25/2006, 09:40 PM	#4
jmann762000 Registered Member Join Date: Feb 2006 Location: florida Posts: 6	do you have a sump? If so,as wierd as it may sound, buy a little clip on fan and clip it to the sump so it blows on the water in the sump. It should bring it down a few degrees.