Multi-tube plant cash

With tubes (two-sided openly) size 1 middle interior diameter very small ca.  1,9cm and ca.  8,5cm long (for Jungwelse)

 

With tubes (two-sided openly) size 2 middle interior diameter  ca. 2,7 cm and ca.10cm long
(for small L- catfishes, e.g. L46, L174 and small peckoltia-types).
For animals longer than 8 cm you need size 3!  

With tubes (two-sided openly) size 3 middle interior diameter ca. 3,1 cm and ca.12 cm long
(for middle L-Welse z.B.L201, L260, L270, L134, L181, L183 and larger Pekoltia-types)
 

With tubes (two-sided openly) size 4 middle interior diameter ca.  3,7 cm and ca. 14 cm long
(for larger Welse for example L66, L204, L333)