I have never had more then a guppy or two nor tried to breed them so I'm not exactly sure what to put in the tank. I have a ten gallon tank a little more then halfway full with 4 females and 2 male guppies. I'm going to buy a breeder box soon and I have a single small plastic plant. Otherwise the tank is empty. I have some store bought sea shells that I could put but I've read both positive and negative views on those so thus far I have not added anything. Any suggestions for substrate and plants? Thank you!