I might test once every two months or so. I do test while i'm cycling and after I add to a tank to monitor where the bio load is at until the tank takes care of everything.
When I set a tank up - yup I test. Testing the apistos tank every other day since I'm trying to bring the pH down - but an established tank I don't test often - 2-3 times a year, maybe.
I rarely test. I usually use old gravel or a cycled filter when I set up a new tank so "new tank syndrome" isn't an issue. With larger volume tanks, the water stays well buffered, and as long as the fish appear healthy, I don't see a need to.
i did in the beginning but i havent in ages. i figure with the weekly water changes and conditioner no too much need. that and the fact the water never kills my fish its either another fish, my ignorance, or an act of god.
The only tank I test is the new planted set up that has CO2 and new wood, new substrate and the Ph is about 5.5 so I dont want to add fish until that levels off about 6.2 or so.
I test if I have concerns. I do test for hardness (gh/kh) alot in my invertebrate tanks as I have to fudge with these values to keep more difficult species.
I test when I see spawning so I know what I did right :lol:
I test new tanks too, but like above I use 'old' gravel etc so it's not really a problem. Actually I have never even seen the 'ammonia spike' a new tank is suppost to get. But with my first tank years and years ago I didnt know about it and since then I have always had stuff from other tanks.
It is funny how the longer you've been in the hobby, the less you follow the "rules." I used to test regularly when I had very basic tank setups, but I learned if you maintain regularly, then the numbers never got out of control. With multiple large tank setups, I barely have time to do my water changes and move fish around as needed. There aren't enough hours in the day to follow the "rules."
I test new tanks until I get everything stabilized, once I've got a good balance between waterchanges and feeding, the tank generally takes care of itself. In my experience, once the routine is set the water parameters stay relatively stable.