Just realised I forgot to treat the water when I put it in the tank, will it matter at all since am only on day 1 of cycling? Should I go and throw some in now or leave it
It's not going to make a difference as clorine kills the beneficial bacteria and does harm to the fish. Add some de-chlorinator now and remember t do so in the future!!
Chlorine will atually disipate from the water on it's own in about 24 hours (or when aerated) but chloramine won't. As mentioned, add it now and you should be fne.