Moss might not be the best choice to "fill a tank", because if it gets too thick, it dies inside because of lack of light, and is only left green on the outside. If a piece of moss is left without regular pruning, it traps large amounts of dirt and debris. Aquarium shrimps keeps moss clean and fresh, but unfortunately they woun't live long in a tank full of free swimming fish. I keep a lot of shrimps, but I only keep catfish with them since they don't hunt shrimp. But livebearers like platy do... :-/ And in general, moss mostly grows on the bottom, but livebearer fry tends to seek to the surface and upper part of the tank. So floating plants and/or plants that grows from the bottom and all the way up to the surface, that is what you need
So to make "a jungle" for your fry to hide in, keep other plants that can grow in the entire water column in a fish tank.
Fast growing plants with a stem, like something we here in Norway has named "
Hornblad", is cheap, grows like weed and gives plenty of hiding spaces for fry. It is a stem plant, but does not produce roots, so it's best left floating in the tank where it will settle in a quiet corner and starts growing. It can easily fill a tank - just give it time
On other times of the year, I would recommend you to take a look in the "
Plants for sale" section here on Akvaforum, but since it's way to cold to ship tropical plants by mail now, you will have to either find an ad from a person living close to you (so you can pick up the plants yourself), or buy the plants in your LFS (local fish store).
There are lots of plants that would suite your fish tank, but hornblad is probably the easiest and the most fast growing aquarium plant I know of
PS! Here's some info about the
plant I suggested IN ENGLISH (yippi, hehe)
Seems like the english popular name for it is Common Hornwort.
Here is also some more for you to read about stem plants in a fish tank:
an article in english where hornwort is mentioned (and lots of other plants).
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