Welcome aboard ?Hey guys....this is my first post! Haven't read all these but figured I'd put my 2 cents. I've been doing tanks prob 4-5 years but got sucked in quick, learned a lot and still have lots more to do. I heard this formula a while ago and threw it away. My recommendation would be to just put as many fish as you think looks nice and then maintain it properly. I raise all big catfish and I'm WAY over that number but all my fish cram under a log all day and the tank looks empty. That being said, they're big messy eaters so I have 2 FX6 filters, a Marineland hanging filter, and I'm doing 1 to 2 30% water changes, all on a single 125 gallon tank twice a week. Yes...overkill...but when I look at my fish in there and how healthy they are I smile. ? and if you have a garden hose and a siphon nearby the water change takes 15 mins. Point is...I don't worry as much about the exact biomass in the tank so much as what I need to do to maintain it. Water changes are life, change your filter media, often. Fish tanks aren't meant to sit there for months with no love. If you're trying to figure it out a safe formula for stocking your tank...there is none, just take care of it.