Thanks for all the nominations.
The tank is a Fluval Duo 600 which is 60cm x 35cm x 35cm (24" x 14" x 14") which is a bit over 70 litres (20 gal US/17 UK gal). I have replaced the stock light fitting (2 x 15w) with an over tank luminaire with 2 x 36w power compact.
To give you an idea of the size the spray bar running across the top back is 18mm (0.7") in diameter.
The filtration is currently two Fluval 104 external cannister filters - these each add about 5 litres (1 gal) to the overall water column, so strictly speaking the tank is just about the 20 gal limit for nanos
One of the cannisters has some polyfilter in it which gets changed for carbin every so often, the other is for circulation only.
I will be adding a CPR Bak-Pak2R as soon as it arrives - had to special order it as there is not much nano equipment in the UK yet.
Cheers, Eddie