The light is a dennerle LED 5.0 and so it could be a height issue as it's adjustable up and down... it's not quite at the top of the setting so maybe that's need to be moved upwards .
Thanks for hanging in there
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You're welcome. On the light, I actually meant the intensity might be too high, so lowering the light intensity could help. In my experience, albeit with low-tech/natural tanks only, the light is most often the cause of problem algae. The duration can adjust things if the intensity is not too high or conversely too low to begin with. Not saying it is here, just one factor to consider. From the photos in an earlier post I would think the light is more on the bright side than too weak, but that is only going from the photos.