Okay so if I get some plants and moss balls and put them in a jar fill it with tap water and let it sit for a few days with indirect sunlight then add some shrimp eggs (fairy or brine shrimp) will they hatch? or do i need to add some ammonia for it to work?Thanks
I don't think there's any point in adding ammonia and trying to do proper fishless cycle.
With this kind of set up, you're relying on the plants to use the minimal amounts of ammonia produced by the shrimps and with enough plants and a small amount of livestock it's fine to just add them, once your plants are established; you
will need to have an ammonia test so you can monitor it very closely for the first few days/week to make sure it's working out.
I don't know much about fairy shrimps; don't they need brackish/salt water, like brine shrimp? If they do then you'd need marine plants, as I believe salt water will kill most aquatic plants, so that might make things a lot harder. I have no real experience with marine set ups, so I can't really advise on that.
...they having been surviving for 6 months already but I can tell they are just barely alive...
And this is the major issue. We can probably all think of ways we think it would be cute, or fun, or interesting, to keep fish or other critters but no animal should ever,
ever have to suffer for our aesthetic whims.
That's precisely why I would push
extremely hard for anyone thinking of trying anything like this to have a proper, stable, filtered tank available, at all times, in case things go wrong. If your critters are not thriving, you should not, under any circumstances, be keeping them in there.
The suffering of animals might, possibly, be justified in the name of scientific research or medicine, but so we can have some shrimps in a jar because we like the idea? Or a goldfish in a bowl because it looks cute? No, no, no, not morally acceptable or justifiable in a hobby.