I know this thread is somewhat dead, but...here it is.
So this golden rule for inch of fish or thriving in as large of space etc etc is all great, but when I looked at getting my feet wet with a saltwater tank in the mid 90's I was always told you need a minimum of a 55 gallon for fo system.
Fast forward to 2004 and I find a newer craze that called "nano reef". I have since set up a 20 gallon and now a 7 gallon aquarium, the 20 gallon residents incude 2 false clowns, a royal gamma and a green banded goby. All those fish have done and are doing great in this tank for 4 years now and by years end will be moving to a 65 gallon tall tank.
Is my 20 gallon overstocked? Probably. Do the fish look and act healthy? Yes!!!
I've seen some of tanks in the 180-240 gallon range that people here have and when I see those people having 10-15 fishin those systems I ask myself, why doesn't anyoneconsider those tanks overstocked and crowded. 4 tangs, a school of chromis and a handful of other fish in a 240 gallon? I am sorry but not everyone has the room for a large aquarium to properly house mostof the fish AND corals that we have in our trade.
If anyone ever goes scuba diving in the reefs of the world you will really see that yes all the fish we keep do in fact have a much larger home that anyone can provide. But what we are doing is reefkeepinga very very small portion of the worlds ocean. No one should say they are an expert unless they have spent at least 20+ years studying the worlds ocean and also captive aquariums as well.
I'll jump off my soap box, sorry to step on toes with this post but like I mentioned I really get disgusted when someone tells me what I need to keep a reef alive.
Cheers,
Alex