Who Gives A Fish Forums

My test kit's got paper tabs, bunch of 'em. Don't have chlorine in the API test tube kit though.

coltin wrote: ↑Mon Nov 04, 2024 7:41 am Unless someone's topping off the tank with untreated tap water, I'm not seeing how chlorine levels would spike after a water change with dechlorinated water.

That's what's got me stumped - nothing's being added.

I'd say it's possible the chlorine level is rising due to a few factors. Firstly, some test kits might not be entirely accurate, so it's worth double-checking with a different kit. Secondly, if you're using a dechlorinator that's not very effective, it might not be removing all the chlorine from the ...

I'm still trying to wrap my head around this - I treat for chlorine and it tests fine, but days later, no water change, no ammonia spike, yet chlorine levels start to climb again. Is it necessary to regularly treat for chlorine even after the initial treatment?