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This question is kind of hard, typically the most widely known rule for stocking a tank is the one inch of fish per gallon of water rule. So a fish 3" needs 3 gallons of water or cubic space. However it's also plays a factor of, clean up crew and filtration to handle fish waste and over feeding of food to keep water quality correct. So if you had say 10 damsels and 20 chromis, in a 150 that's 30 gallons of water used and those fish don't get much bigger than an inch... But if you where to put say a 10 Tang, and a 20 trigger in there that starts of at an inch they would take up your entire 150 because they grow so big and they grow fast. Get what I'm saying you have to go off the size they will grow tooJust curious as to what is considered medium or heavy stocked tank ? Loke how many fish give or take ? I have a 150 with 7 small fish a CBB, and a pinktail trigher.
I know I have a shoehorn somewhere around here lol. Thanks for the second opinion!I usually suggest one 3" mature fish per 7 gallons of water.
Double that for your CBB, maybe triple that for your trigger since they are often messy pigs.
I would say your 150 gallon tank is somewhere between empty and lightly stocked.
You can leave it at this level and have a fantasy land of minimal maintenance (to me).
Or you can do what I did and shove them in with a shoehorn (lol, will you need to Google that? Enquiring minds want to know.[emoji846]) and use up every last bit of space and wonder why you can't get your nitrate below 80.[emoji849]

