roach (Rutilus rutilus )
Between 2 - 4 inches
The roach (Rutilus rutilus) is a common native freshwater fish found in ponds, lakes, rivers, and canals across the UK. It is a medium-sized fish found in large shoals, they can reach a max size of around 45 cm and weigh over 4 lb however 20 to 30 cm is more common, roach are typically silver in colour with reddish fins and a slightly arched back. Roach can tolerate a range of water conditions and are, making them well-suited to still and slow-moving waters.
Best kept in shoals of 5 or more
Feeding 🐛 
Roach will eat most flake and pelleted food like 
Floating pond sticks
Bloodworm pellet
Goldfish flakes
Sturgeon pellets
Aswell as live and frozen foods like
Bloodworm 
Daphnia
Mysis shrimp 
Gammarus shrimp
Krill
And tubifex worm,
Earthworms are also a good good source, 
Roach will also eat small aquatic invertebrates like water louse, smaller pond snails and any flies or other bugs that fall on the water surface, they will sometimes consume plant matter.
PH 🌊 
6.5 - 7.5
Temp 🌡️ 
 3c°c- 25°c
Optimal temp
10 °c - 22°c
Tank mates 🐟 
Roach can live with most other pond fish, 
Carp
Goldfish
Orfe
Gudgeon
Tench
Rudd
Barbel 
Ide
Bream
Dace
Chub
Perch ( if a similar size )
Aswell as smaller species like minnow, sticklebacks, stone loach and weather loach.
In the wild they're often found in mixed shoals with other fish like rudd, gudgeon, dace and bream which they can also hybridise with.