I have a 15 g with 2 guppies,an apple snail and a female betta. Set at 75, heavily planted. And a 5 with a female betta not heated, regional temp is high 60s, low 80s. And am about to have an indoor 250 g iguana pond, not heated, inhabitants are going to be a pleco, 3 mollies and a couple gold fish. So my first question is what shrimp could I get that would reproduce enough that I would have about six in the five gallon at a time and about 12 in the 15 at a time and if I see any more I will take them out and put them in the pond? And other than the shrimp what else could I put in the 15 gallon, 3 more guppies(only sold in trios), more snail(if so how many), or other?