Well, the "lump" is most definetly an internal parasite (it has come and gone twice since my last post). The weird thing is that it was constantly present until I started the previous medication (protozin). Trust me on this; I checked all the time, morning, daytime, evening and night! However; with recent developments I know this is coming from inside. (Weird though; Protozine is not supposed to do anything against internal parasites. Maybe just a coincidence?)
I bought a quarantine tank today and will transfer the loach tomorrow. I was able to get Flubenol in Sweden (1,5 hours from where I live in Oslo, and it was simply sold over the counter! Typical Norwegian regulations that it`s not available here AT ALL!! Even with prescription

)
The Flubenol is only available in Pasta form, so after a lot of checking I have worked out the dosage. (difficult to give it directly in the loaches` mouth as it is supposed to be done, as it`s intended for cats and dogs

)
I`ll keep posting as to the results. (I know, It`s "only" a fish, but this has become something of a mystery to me, and the little "bugger" has been hanging on for so long that I`ve grown really fond of him/her

)
Kind regards
Marius