Hi, new to the group, so Hello.

I am 4 weeks into cycling my 55g. I have minimal readings for ammonia
and nitrites and 20ppm for Nitrates so hoping that I nearing the end of
this process. I have 3 fish in there who are thriving and having the
time of their lives. I have been changing the water twice a week,
doing smallish changes, around 10%. I have been told to take from the
top of the tank so as not to disturb all the helpful bacteria's forming
in the gravel.

So the question is.... After a month, and with the nitrate level high,
should I start hoovering the gravel or wait until the cycle is
completley over? Should I now do a 25% water change as it has only
been small one's for the past month? Should I now change the charcoal
and sponge filters in my filter or again just wait till the cycle is
finished so that I don't disturb everything that needs to be
established?

Sooo many questions. Don't think that it will be the last either.
Sorry.

Thanks in advance
Mellie