Wally, I think you should either stop the auto water change and continue with two part only - and do a small water change every couple weeks - OR stop the two part and ONLY do the auto water changes..
don’t be paranoid about alk- It can drop below 7 without any issues. You don’t have enough demand to have a sudden drop. You don’t need to be doing both of these things, I don’t think.
Continue testing alk but don’t react to it before seeing a trend- so don’t react before at least two tests a day or two apart from each other.
I think between the auto water changes and the two part additions, something is getting wonky..
Simplify..
Matt, you are absolutely correct, especially at this FRAG stage.
When I started his whole Auto Water changing I was thinking exactly what you just stated.
That "if I change water frequently", would I ever need to dose till I started having growing colonies.
My thought was Frequent/Small Water changes would be Ideal to keep Trace Elements in check, (and never have to buy test Kits or Additives for things like Strontium, etc).
That theory was proven to be correct since I did have a K testing kit, and K was optimal every time I tested (so my bag of KCL sat un-opened on the shelf)
That is also why I also got off the AF Component 1,2,3 Dosing. Why dose More trace elements, on top of Elements in Salt Water Changes. It could put some trace elements to toxic levels. So I stopped and converted over to ESV A/B (Ed also Recommended this change as a simplification)
And I didn't need to dose, till one point in time. There was a drop in ALK, and it continued. That could have been just Coraline spurt.
I dose to keep Alk stable which at the time was 2.5ml per day.
I needed to increase to 5.0ml per day, 7.5ml, and eventually 10ml.
And recently I had to lower dosing, to avoid Alk going to high. That's not the direction dosing usually goes.
I think my problem was Auto Water changes were in-consistent days and quantities changed (Since not totally automatic implementation)
All related to making water, not The Easy Button Push Some days.
I was too busy to do the push, since I needed to watched the WC happen (trust factor) and had to clean up drain.
So you are correct.
Both frequent WC & DOSing are not needed.
-> I like Dosing, since daily and Automatic and consistent.
-> I like Water changes NO more than once every two weeks.
-> I also miss that with Auto Water Changer in SUMP, I don't sweep the DT with a hose (once every while), to get detritus off bottom (as much as I hate doing that).
---> So for now, I'll do a 10% water change (10 Gallons) one every two weeks. Once every month do the manual way for Tank Sweep (Now bare bottom, need it for tidy look).
---> Stop dosing till I need to dose, based on new WC bi-weekly schedule
------> Monitor ALK VERY closely and adjust dosing as needed.
No point doing Trition Water or Fauna test.
Especially after reading this:
http://www.ultimatereef.net/threads/triton-lab-test-versus-fauna-marin-multi-reference.696212/
My Salfert and Hanna kits are good enough.