Display tank algae

[Wildcats1023]

I have a 220 gallon with 40 gallon breeder sump. It has been set up since January. I upgraded from a 90 and used my rock from the 90 and added additional dry rock. I'm having a terrible time with algae on the display glass. I use a 4 stage rodi from BRS and I get 0 tds from it. My problem is my sump is nearly spotless. I do not have hardly any algae growing in my sump at all. I have tried a couple of times to grow chaeto without any luck and I have tried mexican calerpa with no luck. I have a led grow light above the sump. The algae is growing on the display glass mostly very little on my rocks.

I don't understand why algae will grow in my display but not in the sump. I am using ATI Sunpower 8 bulb over the display. The bulbs are less than a year old. 6 of them are around 9 months and the other 2 are around 7 months use.

Any ideas? Could it be the bulbs? I know there are different opinions on whether old bulbs will cause algae to grow more.

 

[Dennis McGrath]

What kind of a CUC do you have? How long do you have the lights on each day?

 

[Wildcats1023]

What kind of a CUC do you have? How long do you have the lights on each day?

I have have turbo snails, nassarious snails, a few bumble bee snails and blue leg hermit crabs. I have sb reef led strips that are on for 1 hr before t5s. The t5s are on for 8 hrs then led back on for 1 hr

 

[Wildcats1023]

I have have turbo snails, nassarious snails, a few bumble bee snails and blue leg hermit crabs. I have sb reef led strips that are on for 1 hr before t5s. The t5s are on for 8 hrs then led back on for 1 hr

The sump light is on opposite display tank lights for 14 hrs

 

[saltyfilmfolks]

What led grow lamp?
Do you have corraline in the sump?

What is the turnover in the system. Ie how much flow is in the sump tongrow macros

Is the flow too slow and keeping funk in the DT is a question.

 

[Wildcats1023]

UFO Led Grow Light, Growstar 150W Full Spectrum Plant Light with Cree COB and Switch for Indoor Plants Seeding, Growing and Flowering. (150w) https://www.amazon.com/dp/B07312WKX2/ref=cm_sw_r_cp_apa_0OiHBbK61PBWB

I have a Jecod dcs-12000 return pump set at 20%.

In display I have 2 Icecap 3k one is positioned vertically and the other horizontal. On opposite ends of the tank.

 

[Wildcats1023]

I have have turbo snails, nassarious snails, a few bumble bee snails and blue leg hermit crabs. I have sb reef led strips that are on for 1 hr before t5s. The t5s are on for 8 hrs then led back on for 1 hr

What led grow lamp?
Do you have corraline in the sump?

What is the turnover in the system. Ie how much flow is in the sump tongrow macros

Is the flow too slow and keeping funk in the DT is a question.

No corraline in sump or display. All macros I have tried I can visually see movement in the sump. As far as exact flow amounts I'm not sure.