Who Gives A Fish Forums

Posted: **Sat Jul 19, 2025 10:53 pm**

hi there, just need some info on this...

i get RO water from my parents - our tap water has a pretty high 4.0 nitrite reading, but after the Reverse osmosis it drops to 0.1. my question is, is that 0.1 reading ok for my fish and inverts?

also, i got a 25 litre can of fresh spring water from a nearby farm and it tests at 0 for nitrites - is that a better option to use?

my tank's nitrite level is 0.1 and my ammonia is also 0.1, the booklet says that's fine for a tank with 27 degrees and a ph of 8.5, but i'm not so sure - i thought both should be 0? with my test kit, 0 should mean the test turns out completely white... but my nitrite test is showing a really faint pink colour, which i think means it's not completely nitrite-free...

any help would be great, thanks

Posted: **Sat Jul 19, 2025 11:18 pm**

I'd stick with the RO water, just make sure to change the membrane if the readings start going up. What's the TDS reading on it, by the way?

Posted: **Sat Jul 19, 2025 11:32 pm**

about 300, yeah its a new unit, only 3 weeks old... the fountain water from the local place has some kinda approval for being clean, i tested it and no nitrites show up, maybe i should just use that instead...

Posted: **Sun Jul 20, 2025 12:15 am**