Hmmm, tricky one. There is someone on another forum asking something very similar (shrimps, 15 litre biorb life - it's not you is it
) and the replies on there are to get a different tank (not applicable in your case as you already have it) and a comment from someone who has the larger one saying he's not sure how shrimps would cope, he wonders if they'd get stuck in the filter.
But for shrimps in general -
Red cherry shimps are one of the hardiest, colourful shrimps. They like temps between 21 and 27 deg C.
You shouldn't keep different colour morphs of the same species or you'll end up with hybrid colours, most likely brown. Cherry shrimps do come in different colours such as red, yellow, orange; rili shrimps are the same species. Then there's the crystal shrimps - I've come across red and black, tiger shrimps are another colour of these. Check out what species any shrimp is before mixing them -
this is a useful site.
Most shrimps do eat algae but I also feed mine on
Hikari shrimp cuisine. I crush the pellets a bit so the babies can get some.
Shrimps like hiding places as they have to shed their skins to grow. Even though there won't be any fish to eat them in this vulnerable stage they will still prefer somewhere to hide while the new skin hardens. Either live plants (the kind fastened to decor in a biorb) or fake plants with lots of small leaves.
You could try the TSS, but bear in mind that shrimps are more sensitive to ammonia and nitrite than fish are, so you'd need to make sure the biorb was well and truly free of them before adding shrimps.