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I am currently running all for reef powder and not having this issue, are you making sure the solution is well mixed? I usually have it mixing for about 30 mins to a magnetic stirrer and then let it sit for about 24 hours before using.
get a fan and have it blow air over the surface. should help lower it a few degrees. will up evap though so make sure you have enough water to replace your ATO
I would do option 2 personally, would just make sense since you already have the other fixture if you were not trying to replace all the lights at once.