Yesterday was a major refurb day for my main tank, and I was expecting things to take a bit of time to settle down. However things have gone very odd, at least according the my seneye. Put simply the seneye has been reading a steady increase in ammonia since putting it back in the main tank (I had it in the holding tank during the work). So it was all up and running by around 6pm last night, and ammonia was showing .03ppm on the seneye at 9pm, so did a 25% water change (bigger this late was not an option, 25% takes about an hour), level dropped a little .027, but I had noted the seneye tends to stay high for a while after a water change if it had any non zero reading before hand. 5.30am checked again and its shown a rise through the night to over .06ppm. Something did not seem right, so I got the liquid test kits I had out (I had 3, JBL - normally for my nano tank, API - Previous one for main tank, kit was running low and Nutrafin brand new set for future use on main tank) and while the test were developing started another water change (again 25%) After the water change the seneye had shown .041 and has remained stable at that level since. Now here is the kicker, all 3 liquid tests showed clear 0 readings Obviously they kind of ammonia readings the seneye are showing are very worrying and big water change plus get some zeolite etc as soon as possible would be the order of the day. But with all 3 liquid kits showing 0 I am wondering if its the seneye playing up. Does anyone else have experience with this?