Purchased a Fig 8 a week ago. He is in a slightly brackish 29 gal tank. I'd like to add a few other fish if possible. Could I add another Fig 8 and 3-5 mollies, or what about 2 more fig 8's and 3-5 mollies? So either 2 or 3 total Fig 8s and 3-5 mollies. Any other fish work well with the puffers, in a brakish 29 gal?? Do I need to add or adjust plants and such when I add the fish??