How often should I test?

[KazAngel]

I have a 200L (approx) tank how often should I test for PH, amonia, nitrites, nitrates? twice weekly, weekly, monthly?

[mitcore]

i test my ph and hardness weekly after a water change as for the rest i only test if there is something wrong in my tanks

[Halelorf]

I test all those right before and after I do water changes and additional testings only if I think something isn't right with the tank.

[gm72]

Depends on the tank and your experience level. I don't test for anything in 9 of my 12 tanks because I know what the readings would be. They have been established for quite some time and I am very familiar with the capacity of the filtration in relation to my maintenance schedule and stocking level.

[Nick_Pavlovski]

Becuase I'm running smaller tanks, I do mine fortnightly but feel that really they should be weekly.
AS GM said, bigger tanks usually need less because dangerous changes only happen when you really do something big to the tank.

[Pr0eve]

I do weekly tests.

[lasm]

Weekly should be o.k.

[sergo]

i test ph, gh and kh typically at w/c time to make sure i don't throw the water way out of balance, the others i know are ok so i don't bother.

[CAX474]

Yes weekly after a water change as you never know what might be in the new water! I know someone who did a patial water change and when he checked the ph it was at 8.6, so I say when you change water check it to be safe.

[sergo]

i check the ph of the water before i put it in the tank.