Oh, I see. I was trying to do it the wrong way around. Stupid.
Thank you.

Hi, I'm new here and pretty much useless with computers...

My related problem with "my aquaria" is that I don't seem to be able to add species of cats to "My aquaria". When I click "Go add some", it gives me a table into which I can't add anything, only go on further to view all species and users ...

Hi. I would have to back Matt on this. I have had a styro background in my tank for some 10+ years. It is covered with a thin layer of cement and then epoxy resin.
It was completely intact before I recently added two L191:s to the tank. Now there's bits missing and white styro visible on proud parts ...