I tried it too unfortunately it was the same for me.
I have tried them all today
And it is still the same
The skill does not increase
I hear ya the not being able to put fish in tanks is also a serious one I’ve reported that still goes ignored over a month later. I have seen this one too for since the same time they broke the fish.
I was not able to play for the last 3 months and now just back to the game since yesterday. I am really shocked to see that this bug is still there. I would have expected this to be fixed after it was reported 4 monts ago, especially as it worked before and thus should be an easy fix…
This is still not fixed… Really !?
Wasn’t July and August supposed to be bugfix months ?
Simply unbelievable. Very sad as I usually play the role of the stay at home mom.
So cleaning is part of my routine. 
Nope it’s still not fixed neither are the fish tanks that were broken months ago.
Is it even on the known issues list? I don’t think I have seen it there…
Some bugs seem to not be looked at somehow.
Thank you for confirming this @EllaEstella 