GmoAndres, Thank you.
how many cardinal tetras are in the tank? Can you give us the specs of your tank? Your discus are living the high life!
For the cardinal tetras, there are probably around 200 of them.
The specs of my Tank:
Rena 1.5 meter - 450 liter
light 1.25 WPL (T5)
Teco TR-15 Chiller
CO2 + PH controller + 2 outside reactors
2 X Eheim pro 3 2028
36W UV
Automatic water change (100% RO) 100% a week.
Under substrate Heating cable - Rena 15m 100W
Substrate - 1st layer Pumice 2cm, 2nd layer Pumice+peat+humus 3cm, 3rd layer JBL Aquabasis 2cm, 4th layer crushed quartz 5cm.
Water Param.: PH 5.9, KH 1.5, CO2 40ppm, NO3 15, PO4 1.5, TDS 275ms, GH 2, Temp 25.5c
Automatic DIY fertilization with peristaltic pumps - KNO3, KH2PO4, KCL, MgSO4, Iron gluconate, Iron EDTA, CSM+B, Flourish Excel (PPS Pro alike).
Did I forgot something???
For the discus, as a former discus breeder, I know thay will do better in warmer and darker waters. Somehow they adopt to this harsh environment and actually leying eggs all around.
Shay