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You will prob have to cut the threaded part off the bottle to make the hole big enough for the fish. Put some food in it and they will eventually go in after it. I have also had luck attaching a 2 liter bottle to a dowel rod. Cut the bottom off of it an put it in the tank and squirt food...
Get same species either get one larger or smaller. They will change sex accordingly. larger female, smaller male. If you get the same size they will fight until established and sex determined.