Greetings from Barcelona, opaeulalovers!!
Excuse me so long with no answers. December was hectic. But I'm back again hohohoh.
Two month after setup tank seems to be mature. Brown algae cover glasses, green algae cover lava rocks. Surface biofilm tend to lose density. No feed.
I've introduced a bit of thread algae, good nitrate controllator.
About snails: I've put melanoides an theodoxus. Both are freshwater snails, but resist brackish water very well.
Girls are ok, no females berried yet. In comparison with other shrimps halocaridina way of life so sloooowly...