What would you rec for a 5g bucket
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You could easily manage your ca/alk requirements with kalk and never need to dose 2-part with a tank of your size. In fact, "The Oracle" (Randy Farley Holmes) has written, and suggests, that tanks up to 90G can run indefinitely running kalk...I can back that up, my 90G is proof.
The key consideration is your evaporation. If you run your thermostat at the same temp all winter then you will evaporate similar amounts from week to week. If you consistently run A/C during the summer then you will also evaporate at the same level every week. Spring and fall can be a slight challenge because you might have more temp fluctuations, especially if you open your windows sometimes, etc. This is not a big deal to monitor and adjust accordingly.
That being said, as long you check your ca/alk weekly (or more) during periods of fluctuating temp then you can make adjustments. IMO, you still need to test regularly when dosing 2-part and make adjustments based on your coral growth and uptake. Same goes for dosing kalk.
As Joe said, a dosing pump can malfunction so dosing 2-part can have risks too. You can also have evaporation issues with kalk in ato. Weigh your options, compare the possible risks, and see what works best for you. You can always try some kalk, see if it works, and if not...go out and spend $60 on an inexpensive dosing pump.
Based on the size of your tank, I'd add 3 tsp (1 tbsp) to your 5G ato bucket and see what that does over a week, then add more/less as needed. Make sure the tube is positioned about an inch above the bottom of your bucket so you don't pump in the milky white precipitate that will settle at the bottom of the reservoir. It won't hurt anything if you do, just don't need that sediment clouding up your tank and clogging up your ato pump (which it will eventually).