Hello,
my 40gal cycled 1.5 or 2 months ago. I had 8 male guppies(male only tank).
I test water every other day.
0 ammonia
0 nitrite
5 or so nitrate.
I have some live plants
I change water every other week.
for last 3 weeks, 1 guppy die every week. tail seem to get finrot, then it stop eating...