Temperature can affect solubility of most soluble compounds, but I am not sure that the temperature ranges we are talking about here really makes a huge difference for what we are interested in. I think the bigger question is the oxygen solubility - if it gets too hot there will be less oxygen in the water. On a hot florida day, outside I bet your water could easily hit 90 or hotter in a colored tub, which can actually cut down the solubility of oxygen by as much as 30%. You might consider letting it rest for several hours and let it cool down or warm up to let the oxygen redissolve before adding it to the tank.
I don't know what the solubility curve for calcium looks like though, maybe randy could tell you more.
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Mass spectrometry... about the only thing in the world more expensive than reefkeeping.
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