bioballs? ecospheres? those are cruel little pretty things that takes advantage of the opae ula shrimp's hardiness :( please don't support them T_T basically the shrimps starbe and feed off their own body mass, getting smaller an smaller until they die.
If you ever set up brackish/SW mini tanks, opae ula shrimps are a wonderful species to keep. they are very hardy and can live many many years.
I've done many jars :) and all of them hold a steady system. it's kind of interesting, nature always tries to balance itself out.
I once had another 0.3 gallon jar with a bajillion scuds and one cherry shrimp!
another one i had was a 3x3in cube container which held a blackworm culture and quite a few snails :D
the blackworms and residents are still alive and reproducing and the water has never been changed. ditto the scud jar.
I believe the trick is to always use fast growing low light stems, preferrably from a sungle species, the right temperature lighting, some snails to start the process off and it will survive by itself for a very long time.
Truthfully I'm not a big fan of floaters alone for water quality, as most are not true aquatic plants (ie. they will die if submered)
I have another gallon tank for the more colorful shrimps XD For my tanks I rarely do timed water changes. I like to repurpose my tank water. eg: Sometimes I use tank water to water my plants, after which I simply top up again.
Here's the ghosties munching on algae wafer bits. My favorite brand is omega one. they dont fall apart the way other algae wafers do in water and seem to decompose at a slower rate;
here are some other shrimps I keep in the 1 gallon:
caridina balbauti (excuse the spelling)