Too Much Light?

X

xrobbx03

Guest
Is there such a thing as too much light on a tank? I have 2x150 HQI MH and 2x65 Actinic PC for a total of 430 watts too much for a 38 gallon that is roughly 36longx12widex18high
 
lionfish1

lionfish1

Member
Don't know if this is really an answer but I have 2x150 mh HQI on my 20 gal. The only real problem I have is temp.

 
teen

teen

Active Member
ive got 250 mh on my 30 gallon. thats like 8 watts per gallon. theres nothing in it yet though besides a hermit and a snail
 
X

xrobbx03

Guest
Originally Posted by lionfish1
Don't know if this is really an answer but I have 2x150 mh HQI on my 20 gal. The only real problem I have is temp.

how bad is your temperature rise with the lights on and drop with the lights off?
Do you have fans in that fixture?
 
lionfish1

lionfish1

Member
There are fans in the fixture but they are just to cool the fixture. I have moved them a little higher but I still get about a 4 deg. swing. So i'm going to get some fans to point at the water.
 
emmitt

emmitt

Member
What do you have in there lionfish? It doesnt look like any corals. Id say that 300w of MH on a 20g tank that is probably 18" high at most is a little much for alot of corals.
You may be getting close to too much for some corals xrobbx but should be fine except for low light corals.
 
X

xrobbx03

Guest
like what corals will i not be able to keep because of too much light
 
blitz99

blitz99

Member
a lot of the softies wont like it much, but if you go sps, clams, etc... you would be golden and could keep anything anywhere.
 
db

db

Member
What MH bulbs you choose is also going to effect what type of corals you will be able to keep. Many 20K bulbs have half as much PAR as some 10K's. I agree that some softies and lps will not be happy. Zoanthids will do fine under high lighting.
 
teen

teen

Active Member
Originally Posted by lionfish1
That picture is older Right now I have some zoos, alot more live rock, and algae


lol, how much more live rock did you fit in there?
 
blitz99

blitz99

Member
Originally Posted by xrobbx03
what types of softies wont do well under that lighting?
obviously sun corals and carnations wont do well, most likely xenia, shrooms, kenya trees, cabbage.
 
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