I never have a need for it, including cycling dry reefs up to par (use submersion timing) nor do we use it in tank rework/turnaround threads.
It's neat what seneye shows: confirms or denies statements made years ago before we had confirmation to the thousandths. What we all deemed zero, not API but a zero ammonia condition, was really just ammonia in flux (emission from organism to nitrification neutrality) but well below lethal levels
We all got really good at identifying lethal/non lethal levels but not really accurate levels till seneye came along
Without using ammonia testing in any stage of reefing, we can still know the presence of lethal levels of ammonia. Clouding and smell are requisite companions, side verifiers.
Medication tanks are different, handy there.
I don't own reefing testing kits above salinity and temp. The top two kits I will never buy are nitrite and ammonia, in that order.
In a normal tank, post-cycle bacteria never ever need refreshment nor support nor anything but our water/hydration. If anyone tries to link bacterial weakness/risk of into their sales for a multi hundred dollar tester, that's a ripoff, because I'll never need that param defined to me in order to reef.
Bacteria are the toughest organisms we foster as a community, not the weakest.
Seneye can warn of a degrading fish in the background before the spike, agreed. It helps suppress stress as a sentry before the event agreed. The reason single fish losses haven't wiped out reef tanks already is due to + surface area from your hundred pounds choice live rock in the display tank (and resulting ~eighty flat football fields surface area)

It's neat to see it flux in precision, but tank layout alternates and stocking density control and remote cam monitoring on your smartphone with twenty dollar web cam for the ultra concerned is same ends.
B
