It's definitely ellobiopsidae. Our own Diseases and Diagnostics thread, that Simon linked, has a post all about it including possible treatment. Ellobiopsidae is highly contagious. So remove any shrimp you see with it immediately into a quarantine tank.
Not many known cures, but Formalin/Malachite treatments seem to have the best possibility of killing it.
I've always like Iwagumi style scapes. So I'm partial to idea #1.
It suits your tank as well, being shallow.
Have you seen Bonsai moss trees for aquariums? Those root driftwood can look really good in a tank. Just got to get the right size for scale.
Here are a couple of vids,
It would be worth trying the salt treatment, or malachite green. I have 'Waterlife fin rot and ulcers' treatment that I got from ProShrimp, that definitely has malachite green in it and may work, though they may sell something 'malachite green' on its own?
Here is a link to their treatments, lots,
Always treat seperately from the main tank, and if you can set up a temporary quarantine tank to house them during the period of treatment, that is better, even a bucket or something would do!
We havent added anything new for a while. The yellow is definitely not eggs but from what I can read on line that is the parasite. It is only on the underside of the shrimp. Looking on line seems to suggest ellobiopsidae!! Sent from my SM-N960F using Tapatalk
Sorry to hear you have a problem. It is difficult to make out from the photos but obviously it is difficult to take photos of something so small?
Try looking here, there were a coupe of possibilities I noticed having a quick glance through it, vorticello, parasites
Both the ones I saw say salt treatment so that may be worth a try anyway (not household salt but aquarium salt)!
Any idea where they came from, have you added anything new recently? I assume the yellow colour is eggs of the shrimp.
Hopefully you can set up a temporary quarantine tank whilst you try the salt treatment and others may give some further advice!