We have a winner!..
Definitively not a stranded reclusive lonesome nerd suffereing collecteritis..Strangely it seems relatively uncluttered and quite clean. Apart from the multitude of tanks there is little extra mess ( hoses , feeding pots, all kind of buckets, nets etc etc) and there is carpet ( looks clean) and no visible mold.
I am quite sure he IS married and the missus likes tanks too. There even are 2 watering cans for the potted plants, and a box of tissues on the table. yup, defenitly married.
If Hercule Poirot were to walk in to the room he would turn to Captain Hastings and say,