ADelphi
Fish Fanatic
Now the uno only has a single light canopy and is priced £79.99 and the duo has a double light canopy and is priced at £99.99, i'm only going to be growing basic plants like hornwort and such and diy co2. Its more of a breeding tank for livebearers, i will put an extra fluval plus 2 in it, so two internal filters. The duo is £20 more but i think it has a better heater too. The uno is 13. 4 uk gallons and the duo is 18 uk gallons 
I think i'm warming to the 18 uk gallons, gives me a bit of space for breeding, what do you think?
Fluval Uno 600 Aquarium Set
Single Light Canopy
Set contains:
1 x Fluval Glass Aquarium
Length 600mm x width 300mm x height 350mm
1 x 600mm Glo-Light Single Light Tube Canopy
1 x Fluval 2 Plus Underwater Filter
1 x 18" Flourescent Bulb
1 x Thermal Compact Heater
1 x Digital Thermometer
1 x Nutrafin Max Tropical Flake Food Tub treatments
1 x Nutrafin Cycle, Aqua Plus, & Plant Grow Water Treatments
1 x Carbon & Polyester Filter Pads
1 x Green-X Phosphate Remover
1 x Aquarium care Guide
4 x Assorted Plastic Plants
Fluval Duo 600 Aquarium Set
Double Light Canopy
Set contains:
1 x Fluval Glass Aquarium
Length 600mm x width 350mm x height 350mm
1 x 600mm Glo-Light Double Light Tube Canopy
1 x Fluval 2 Plus Underwater Filter
2 x 18" Flourescent Bulbs
1 x Tronic Heater
1 x Digital Thermometer
1 x Nutrafin Max Tropical Flake Food Tub
1 x Nutrafin Cycle, Aqua Plus, & Plant Grow Water Treatments
1 x Carbon & Polyester Filter Pads
1 x Green-X Phosphate Remover
1 x Aquarium care Guide
4 x Assorted Plastic Plants
I think i'm warming to the 18 uk gallons, gives me a bit of space for breeding, what do you think?