Fishtanks

I like the fishtanks from one of the old expansions way back in the day where there were several fish in the same tank. Of course, these fish were for harvesting but wouldn't it be possible to have one fishtank that we can put several fish we catch in instead of having a single fish for a single tank? I mean, to have one tank for each type of fish (as a true collector sim would have to have) takes up way too much space. Combining the fish in one tank just makes sense to me.

Just looking at my own livingroom with my 55 gallon tank filled with several fish types, I couldn't imagine if I had to have a different tank for each individual fish. It would be unlivable which is where sims is if your collector tried to keep the best of each fish type alive and displayed.