Reefs tend to be kept way less populated and because everything costs a fortune, unfortunately some folks take more care too. If anything goes wrong, it tends to go wrong big style, but if anyone was to ask me, reef tanks ((certain types) take a fraction of the maintenance and looking after than freshwater tanks do.That makes sense, especially considering it seems that reefs require much smaller and less frequent WCs than fresh. I just had to cut way back on my reef maintenance, I was was reading zeros across the board lol