I finally have a picture of my sorority tank; welcome to Bikini Bottom!
The tank is 14 gallons, with 5 girls. They have been in the sorority for about a month now and they're doing very well together, although they do all try to jump over each other into the air at feeding time. They remind me of a litter of ravenous puppies. I'll have to take a video next time I feed them bloodworms.
For shelter, there are 3 Pineapple houses, 1 Squidward house, and a big coral reef/cave thing. They all have at least 3 exits so nobody gets trapped in a corner. The fake plants are also quite big, they provide excellent cover. I may also add some surface plants in the future but the girls have not shown much aggression beyond normal after the first few days of settling in. In the future if I were to design a sorority, I'd probably prefer to go with live plants. But this one is really fun and colorful. Plus, it's right next to my TV so watching Spongebob is a trip :D