not... they are doing the same

I dont really think so, this aquarium is flora one, it includes many plants which are boubbling everyday.
So air level is max which is possible, I took out styrofoam from bottom which was at tank for about 5 years now... We will see it will help.

1. Water parameters
Temperature 24-26C
pH - 7.0-7.2
Gh - about 12
Kh - about 8
Ammonia etc - 0 (NO3 5-10 cos im adding it by myself, its plant tank)
Water Change every week, about 20% of tank.

2. Tank set up
a) Size. 240liters
b) Substrate. JBL Manado
c) Filtration. Tetra Tec 700
d) Furnishings ...