The inch rule is a rule of thumb, and perhpas a poor one, especially when dealing with a lot of predetorial/territorial fish (i.e. cichlids, etc.)
Anyways, you are essentially correct about the WPs. The higher the bioload the more maintenace and care that will be required due to larger and faster buidlups of toxins. Also, the greater the chance for other issues associated with overcrowding (disease, aggression, stunting, etc.)
Also, the rules of thumb really go out the window on bottom fish and even more so with inverts!
Personally I would say my 30G (see Sig) is overstocked. I let the fish dictate to me what is enough, and those fish are MAXED IMO for my 30G. If I add more, the gouramis get very aggressive and attack other fish (moved extra fish to 75G). The level I have they act peaceful w/ no aggression. I have tried adding more, same issues - removed, aggression left. (Tank decorations, hiding places play a large part too)
Anyways, you are essentially correct about the WPs. The higher the bioload the more maintenace and care that will be required due to larger and faster buidlups of toxins. Also, the greater the chance for other issues associated with overcrowding (disease, aggression, stunting, etc.)
Also, the rules of thumb really go out the window on bottom fish and even more so with inverts!
Personally I would say my 30G (see Sig) is overstocked. I let the fish dictate to me what is enough, and those fish are MAXED IMO for my 30G. If I add more, the gouramis get very aggressive and attack other fish (moved extra fish to 75G). The level I have they act peaceful w/ no aggression. I have tried adding more, same issues - removed, aggression left. (Tank decorations, hiding places play a large part too)