Ammonia Trace ?

[JohnBull]

Recently had to completely drain my tank twice due to house renovations. The filters were 'dry' for around 15 mins x 2,tank is now back in its original place but on the last couple of water tests I noticed a trace ( 0.5 ) of Ammonia reading via my API test kit which is a worry.
 
Tank was fishless cycled 18 months ago,never a trace of anything like this other than the usual higher than normal Nitrate levels via NO-2 levesl in tap water.
 
My 'normal' water changes are 40% on a weekly basis.
 
My tank in 45 gallon and slighty under stocked if anything.
 
Did a 60% water change last night.
 
any advice ?
 
todays reading :  AMM  0.25
                           NITRATE  20 ppm
                           NITRITE   0
 
ALL FISH HEALTHY AND SHOWING NO SIGNS OF DISTRESS BTW

 

[the_lock_man]

There is often confusion between 0ppm and 0.25ppm, the test result needs to be viewed in natural light, otherwise a 0ppm reading has the definite green tinge of the 0.25ppm. This could be your problem.

 

[TwoTankAmin]

I would do nothing but monitor. If ammonia numbers rise, take action. But I would bet you will see it all go back to "normal" pretty fast. Keep en eye on nitrites to be sure.

 

[techen]

I've always been told if its 0.25 blank it. No test will be prefect

 

[JohnBull]

Will keep an eye on things, thanks for the speedy advice.