TANK A

pH-7.2
KH-6d
GH->10d->16d
NO2-0
NO3-0
tank had flourecent light,filter,substrate or rock gravel,dirty leaves,clear surface, zeolite,temp 27C

TANK C

pH-6.8
KH-3d
GH-6d>
NO2-0
NO3-250

tank had substrate,algae,too dark, congested,snails,biological and mechanical flitration,amazon sword,elodea,no changes of water frequently,temp 28C

TANK B
pH-6.4
KH-0d
GH->10d->16d
NO2-0
NO3-100

tank had floating algae.
it was dirty
temp 21C
led light
zeolite crystal