Wow, I would think around 40 maybe a few more. if you figure around 4-5 girls per ten gallons. If its not totally planted maybe a few less. I would put as many plants as you can. I would reccoment live since as they grow you can keep planting.
Oh wow. I FANTASIZE about stocking my 30 gal. ( which I wouldn't have if I hadnt found it floating around in the lake) *has a conniption*. I know nothing about sororities, but 40 girls seems like alot to care for. 40 to name. 40 to feed (let's say each one gets 4 pellets a day, that's 4x40, so 160 pellets). I don't mean to discourage you, but maybe you could spoil 10 or so girls?
It's not set in stone. I have made an offer so we'll see. I was thinking what a great place to keep the girls as they retire from breeding so I'd add maybe 5 fish per year-I'd let the Petco king male hang out in there with a few buddies until the girls were ready to retire-he'd be than banished back to the 10g. I wouldn't keep any active breeders in there because I'd hate to lose my investment if she got tore up or killed for some odd reason. That's also an awful big piece of furniture. I will for sure have at least a 55 gal retirement tank(piece of cake-been there done that) but I really think I can get that 100g set up for a real steal(hopefully for what a new 55g set up would run me). I would have just paid the full asking price but that cuts deeply into my money set aside for quality breeding stock-we CAN'T have that:-D.
It's actually still too small for koi. They need around 500 gallons per fish. A fully grown koi would look like a dog in a half bath in there. It would make an awesome goldfish tank, tho!
But still, really jealous of you potential 100 gal tank. I would love to have one and put an archer fish in it! Or make it into a discus amazon tank. Maybe I should start prowling craigslist. Or maybe not. That sounds like a bad idea.