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Cucumber is a bit of a waste of time, as there is so little nutritional value in it.
Best things are; peas (lightly cooked and deshelled), blanched lettuce (a good green one, like cos, not iceberg!), tomato (my plecs love tomato best; an end slice with no seeds), mango, sweet potato and courgette (zuccini).
It will also need some protein food; high protein granules or shrimp pellets go down well plus prawns and whitefish (cod or haddock; always sea fish though, never freshwater as you don't want to risk introducing any pathogens), and you need some bogwood in your tank as well, for it to rasp on for the lignin.
I will try to get a pic of him but he is so small and hard to findJunk food for fishies, eh?!
Doh, i forgot the OP's other questions
We'd need a pic to have a go at identifying your plec; you could have a look on PlanetCatfish's cat-e-log, which is a great site for catfish IDs.
Plecs do like a fairly strong flow, but it's not essential for their health. If you can arrange the output from your filter along the back wall, so your tank has areas of high flow, and relatively still areas as wel, that's best for the fish
1) How can I tell which golden nugget I've got? (its only 4cm)
2) what treats do they like?
3) what current flow do they like?
never freshwater as you don't want to risk introducing any pathogens), and you need some bogwood in your tank as well, for it to rasp on for the lignin.
I know very little about Golden Nuggets, but I think they need a strong current setup (more about lots of water surface ripple than anything else) to go with a >25C temperature, so that the oxygen levels are maximised... Something in the x10 turnover ballpark of actual flow.
i tried some prawn in my tank and not a single fish was interested to be honest i never see any of my plecs eating meaty food, only the algae discs. and occasionally cucumber.
How big do these plecs actually grow ??
I've recently seen one in a Maidenhead Aquatics store and the label on the tank said it grew to be 25cm, I didn't think they got as big as that.