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Hi Jim. What are your water parameters? Do you measure the GH? If GH is mainly calcium and magnesium ions, then using a GH test kit (e.g. API liquid tests) would allow you to see if there is any variation in your tank water throughout the week. But unless your tap water is very very soft (very low GH) then I would have thought the amount you were adding to the tank with weekly water changes was more than sufficient, right?
 

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My problem is, from the first drop, it turns a light yellow color, almost looks like watered down lemon-aid, but it never changes ! I stopped at 20 drops !! LOL... Oh well... I believe my calcium levels from the tap are going to be just fine.Jim
This is normal, not sure it is broken.
The drops coming from the API bottle should be green, then turn yellow when they hit your sample (unless it is 0GH when the first drop will colour water green). It can be hard to see by the first few drops as the colour is pale, but try looking down through the length of the test tube (without stopper) with it stood on a white surface. The colour should be much easier to make out, compared to looking at the tube through the sides.

You did give the bottle a very good shake first, right? And a shake of the test tube between adding drops? I use my finger to cover the end to shake after each drop. Maybe the end of my finger will drop off in time, but I just can't bear to keep putting the cap on and off...

The yellow colour should get darker with each drop, but will stay yellow. Then with one drop it will suddenly pop green and you have your result. If you've already reached 20 drops (and assuming you've done all the shaking), then you're water is pretty hard and I really don't think you need to add additional calcium!

Is this the tank water you're testing, or your supply (tap) water? If it's your tank water and you've been adding additional calcium then I guess the high GH measurement makes sense! If this is your supply (tap) water then I guess you live in quite a hard water area?
 
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