I enjoyed this joke:

cats
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other cat communities
birds, some cats
Seems like a bit too many fish for that tank?
And they prob don't enjoy that light shining on them that intensely
It's also stressful to the cat because they never get the satisfaction of actually catching the thing they're hunting.. similar to laser pointer. Funny for humans but stressful to the cat
Depends how beefy the filtration is. Cichlids tanks, for example, have to be heavily overstocked with big beefy filtration (including a sump that expands the water volume substantially) because if you stock at normal amounts they kill each other. And cichlids are very common.
Might be tetras, which prefer large groups.
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