I've got my IT-2040 over a 29g. Right now the blues max out at 30% and the whites at 15%. Not sure if I'll end up going up a bit or not with the intensity. The sea rod I collected in 15' of water seems real happy at this current setting.
I know this is old but just wanted to share. I have had the DM165E for about 2.5-3 years. I have recently ( last 6-8 months) have been having a lot more GHA problems but have not been able to pinpoint the source and phosphate levels have been in normal range. I began to think it may be the lights but had nothing to really prove that. Regardless I am now having trouble with one of the lights coming on, it just stutters for a while sometimes. Just sharing my experience.
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