I think the only reason people do large water changes at the end of the cycle is to lower the amount of nitrates in the tank, however, if it's ~15 ppm or so, you should be able to start putting your fish in the tank immediately. I think.
Also, you shouldn't have any nitrite readings. Ever.
yup, kittles is right. You should never have ammonia or nitrIte readings after it is cycled. Your nitrates should not be higher than 20. So test for those, and do a water change until you get it around 10ish then you're good to go.
No, you should be testing for nitrates as well. Have to make sure they're not too high, or even present at all. What kind of test are you using? I'm assuming test strips, because if you had a liquid test kit, it would encompass nitrates. Depending on how far down the fishkeeping 'rabbit hole' you're willing to go you might look into getting an API Freshwater Master Test Kit.
"Rabid hole" rolf!!
I'm using Red Sea's Fresh Lab, it's a liquid kit.
It tests for Ammonia, Nitrites and pH.
My pH is about 7.4 and my other readings are at 0.
Guess Im gonna have to get that other test kit. I picked mine on sale.
So, what I have to monitor for now is the nitrates?
How long have you been cycling your tank for? I've only been doing mine a week with estabilished filter media, substrate and deco and my readings are where they should be but i've never cycled a tank properly before so i'm lost on what to do next lol.
I used two corys to help too, I took them out though when I saw one rolling around because of high nitrites, it disturbed me.
I think I'm going to do a 30% water change and then add my betta. I don't think there is anything else you can do really since your fish are already in there lol. Maybe a water change, to lower Nitrates?
Vilmarisv, your tank may already be perfect for your fish to be in, you just have to test your nitrates to make sure they're not dangerously high. It wouldn't hurt anything if you did a water change, it'd only keep things on the safe side. Same for you, Welsh; if your guys' readings are 0/0/~10 then there shouldn't be any reason to keep the tank empty.
Just be sure that if you're adding a large number of fish to the tank, to add them slowly, over a long period of time. Would suck if you broke your cycle by causing ammonia spikes, and such.