Hi Leanne,
You haven't screwed your tank up but some of the corals may get stressed and you need to deal with it quickly.
The probable reason for the line to come off the dosing pump is that the other end is plugged with calcium carbonate. You can replace the line or use pliers to break it up and then run the dosing pump to flush it out the residue.
With your calcium going up to 500 you will need to make sure your magnesium is 3x that so 1500mg/l. With the Magnesium in the correct ratio the chances of carbonate precipitation on the pump impellers, heaters and sand/gravel is greatly reduced.
So action steps to take are:
1. Temporarily stop calcium going into tank until it is back down to 425 - 440.
2. Add magnesium to bring water to 1500mg/l
3. Then add sodium bicarb to bring the alk back up.
Cheers,
Tim
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