I think any light will promote algae growth over time if you have nitrate issues as well. Obviously MH more than Actinics. But if you have actinics on for almost 12hrs/day, I would definitely consider it a factor in HA.
You should get a timer and limit how long you have them on for. No worries.
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Gary
Tank was up for 7yrs and 10months. Thanks Everyone!
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