Ahhk that makes more sense, yeah i saw that it was 9.5 cm so i couldn't work out where the 240mm was coming from.
But yes, the same species can come out of one river at9.5cm and another at 10cm, realy not a huge difference lol
I found the sponge easy to replace, just cut another sponge to fit.
And i never used the charcoal stuff anyway, i took that cartridge out and filled the back half of the filtre with ceramic noodles.
If you read a few more pages you will find Rineloricaria lanceolata are actually found in Peru aswell, they are quite a widespread species and the look of them does vary from place to place.