


What is my pH, really? (Sera VS Tetra)
Hello, i’m having trouble identifying my pH lately. I just got new tests from Sera which are not yet past the expiration date. In the first place i’m struggling to tell if its 7.5 or 8.0 due to the lighting. Its definitely in that range though. But here comes the second challenge: Before buying the Sera test i had a pH test from Tetra, not an all in one kit, just a pH test box. I got this one from my local pet shop which isn’t a very organized/tidy store at times so the products (especially the aquarium ones) can sometimes seem forgotten or unchecked. Including some of the tests having a thin layer of dust, i urgently needed a pH test back then so i went with it. This test has been giving me some scares because i’ve definitely seen it reach 8.5-9 but i made improvements in my tank that should lower that little by little. The test also appeared to go to a lighter blue at some point so i was assuming that progress though last night it seemed darker again than the picture you’re looking at. Now for the expiration date: I couldn’t find one on the kit at all. Thats why my trust relies on the Sera kit i just got but i want to know Reddit’s opinion because the Tetra test shows a solid 8.5 right now while the Sera test is a debatable 7.5 or 8. I can’t imagine an expired test showing difference bigger than 0.5-1.0 and i dont know if an expired test happens to rather show higher results by any change (than lower) but please let me know!