The bioload inch to inch thing doesnt work as nicely as all that...larger fish are usually messier eaters, messier waste...and for some reason they just give a heavier bioload.
10% h2o changes seem to be common in the reefing world, but what is most important is that you find an water change schedule that complements your tank style and filtration to give you a healthy environment for your animals.
yes... thats why I suggested 1 large fish "around" that size. The biologial filter is good for the 3 damsels that way, then taking them out and adding a 6'' grouper was inteded to be similar to adding say adding 2-3 more Damsels and increasing the bioload capacity... (1) 6" grouper = (6) 2" Damsels... I know in reality its not a perfect comparison, but was meant as an example of not over doing it and getting 2 BIG fish or worst case getting the full stock in one shot... (I've seen that happen)
and the 10% WC was suggested while doing the "damsel cycle" when the tank fully cycles through you can set up WC according to your tanks needs and schedule
PS... I never really cared for the X" per X" gallon rules... I like to play it safe with salt and go crazy with my africans lol
