I don't think it is a big deal having your Ca 485 ppm as long as your alkalinity is O.K. Just don't add any additional Ca until it returns to <450 ppm. The concern with high Ca is it will precipitate on your heater, impellers etc or precipitate lowering your alkalinity. I have had mine drift up to 512 ppm with no ill effects and some try to maintain Ca at 500 ppm to promote coral growth (no proof high Ca actually stimulates coral growth)
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300 gal starphire custom built in pentagon reef (+90 gal sump on Blue Line 100 HD return pump, 210lb LR, Euro-Reef RC250 skimmer, 2x400W MH, 2x28W compacts, 2xTurbelle classic 4002 pumps & Turbelle Stream 6100 on 7095 Multicontroller, running ZEOvit)
Livestock
Fish: damsels; sailfin, yellow, regal & naso tangs; ocellaris & tomato clowns; lyretail anthias; foxface lo; flame angelfish
corals: a few
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