What size fixture do I need

[Engineergoby]

im setting up a 90 gallon tank 48" Long x 18" deep and 24" high. I've settled on ATI and at least 6 bulb configuration. Its going to be mixed LPS and SPS. I was going to buy a 48" light but according to ATI that's overkill. I'm not sure if I'm going with the power module with the LEDs or not we will see how financing looks. I just worry if I hang a 36" fixture will the edges get enough light?

 

[EriksOasis]

Personally I would go with the 48". But a 36" might be enough on the edges depending on height above the tank.

 

[Opus]

I would definitely go with 48". I have a 48" 75 gallon tank and I would never go with 36". I had a 6 bulb T5 setup over it for years and it worked great for LPS and SPS. Now I have 48" LEDs over it.

 

[Engineergoby]

Thanks I didn't feel comfortable with 36" but that was what ATI recommended

 

[Tuffyyyyy]

I think 48" light is fine but 6 bulbs is probably overkill for the other two dimensions.

 

[bif24701]

48"

 

[Salty1962]

48

 

[Engineergoby]

That's what I figured. The numbers on ATI's site threw me off

 

[ATI North America]

That's what I figured. The numbers on ATI's site threw me off

Could you tell me what/where you read that makes you feel this way?

I agree a 48" fixture on a 48" tank is ideal.

 

[Engineergoby]

Could you tell me what/where you read that makes you feel this way?

I agree a 48" fixture on a 48" tank is ideal.

Item # Description Length Width Height Gallons
ATI3301 24” 4x24W Dimmable SunPower with Controller 23.1 inches 9.4 inches 2.1 inches 20-50
ATI3303 24" 6x24W Dimmable SunPower with Controller 23.1 inches 13.4 inches 2.1 inches 40-70
ATI3305 24" 8x24W Dimmable SunPower with Controller 23.1 inches 17.5 inches 2.1 inches 50-100
ATI3307 36" 4x39W Dimmable SunPower with Controller 35.0 inches 9.4 inches 2.1 inches 40-80
ATI3309 36" 6x39W Dimmable SunPower with Controller 35.0 inches 13.4 inches 2.1 inches 60-120
ATI3311 36” 8x39W Dimmable SunPower with Controller 35.0 inches 17.5 inches 2.1 inches 80-160
ATI3313 48" 4x54W Dimmable SunPower with Controller 47.0 inches 9.4 inches 2.1 inches 50-110
ATI3315 48" 6x54W Dimmable SunPower with Controller 47.0 inches 13.4 inches 2.1 inches 80-160
ATI3317 48" 8x54W Dimmable SunPower with Controller 47.0 inches 17.5 inches 2.1 inches 110-220
These are general guidelines only. Many factors, such as tank depth, types of corals, and coral placement can affect individual lighting needs. Please contact your dealer. if you need additional assistance in determining the appropriate size light for your tank.

Sorry it didn't format correctly but the 36" would be good for 80 to 160 gallon