Thanks for the nice comments. Here's the spec;
Tank :
Juwel Rio 125 (32"x20"x14") 34 US gallon, 125 litre
Fish :
Pair of Silver Angels, 8 Cardinal Tetras, 8 Rummynose Tetras, 5 Otos, 2 Cory Julii, 2 Zebra Loach, 2 Siamese Algae Eaters
Plants :
Echinodorus bleheri, E. tenellus, Vallisneria torta var. rubra, Rotala indica, Hygrophila polysperma, H. stricta, Limnolphila sessilflora, Nymphaea japonicus, Cardimine lyrata, Microsorum pteropus, Vesicularia dubyana, Lysimachia nummularia, Eleocharis acicularis, Vallisneria spiralis
Water :
pH 6.8, GH 8, KH 4, N03 5 mg/l, PO4 0.25 mg/l, CO2 20 mg/l, Water change 20% per week 50:50 RO/tap.
Lighting :
2 x 24" 18w T8 Dennerle Special-Plant (3000K)
1 x 24" 18w T8 Arcadia Freshwater (7500K)
1 x 24" 20w T8 Hagen Life-Glo (6700K)
1 x 30" 25w T8 Dennerle Special-Plant (3000K)
99 Watts total - 3 Watts per Gallon
All with reflectors. 10 hour (5 on 2 off 5 on) photo-period (on two separate timers to simulate sunrise/sunset)
CO2 :
2 x Nutrafin units with DIY mix. approx 20 mg/l.
Fertilisation :
Dennerle S7, E15, V30. Pottasium Nitrate added to bring NO3 to 5 mg/l.
Filtration :
Juwel internal, Fluval 204 external filled with bio-media and RowaPhos. Outputs directed to avoid co2 loss. No carbon.
Substrate :
Fine (1 - 3mm) inert gravel with laterite mix.
25W Rena-Cor heater cable, comes on with lights.