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The MP 10 is a power head, I thought he was talking about the return pump. I would check out the Hydor(makers of Koralia) here is the link.
http://premiumaquatics.com/store/merchant.mvc?Screen=PROD&Store_Code=PA&Product_Code=HY-P14801&Category_Code=hydor-seltz
Standard answer is MJ900...almost same GPH as MJ1200 with a lot less watts.
Also I have a Koralia Pico pump...little beast at and very good shape for in a back chamber. Low watts and high GPH check it out.
Those are my two suggestions.
What he told you is the way they do it. I replaced mine about 18 months ago. Got a York but looked at the Rheem too. Unless they changed the rebates, the furnace part is easy money, mine is 96.5 % efficient, the AC part is like 150 bucks and impossible. You have to do this long form that...
Do you have moonlights on it too? Two of those LED bars is going to be a lot of light for moonlight....I have to see it to understand it. During the day I have all my T5 on start with 4 at 10ish 1130 daylights on....930 daylights off 11 blues+actinics off.