Yes its a mature tank.
Stats are all absolutly fine, tested yesterday with the API liquid test kit.
The tank is 125ltr and i have;
9 neon tetras,
2 mollies,
2 platties,
1 angel fish,
1 betta,
2 guppies (inc pictured)
& 1 apple snail.
Last water change was the day before she started doing...