Unrelated?
It doesn’t have to be, you could present on misunderstood giants - wels catfish of differing types.
Or
You could use it as an opportunity to highlight the bad buys - pengasius, shark catfish, black sharks, the stuff that unsuspecting aquarists pick up from wall mart.
Or
you could explain how to keep those monsters happy when they do pick them up
Or
You could do a presentation about you, who you are, why you keep monsters, what’s involved, the people you get to talk to, the costs involved, etc. and why they might like to do the same or to some, why they might not!
Best to choose what message you want to get across first and then build the presentation around that. The slides will all fit in somewhere.
Eg.
On monsters, put across how cute they are, how readily available, how newbies and old timers alike get duped into buying them , Then show them as adults.
Then go on to the commitment to keep them, the warnings, then go on to the joy they bring. Ending with the pleasure you get from keeping them correctly and the years of them as part of the family
This way those that want to commit can and will, those that don’t want that commitment can avoid them and you are doing good for the hobby both ways too.