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Maybe an atavic behavior from their marine ancestors, they are tough enough and lack of predators to be bothered by this (maybe) useless behavior.

Hello. I will try a thing. I caught many Theodoxus fluviatilis, a freshwater nerite common in Europa. It's the breeding season so they have already covered all sufaces with calceous capsules :-D Anyway, this specie is easy to breed and... Can tolerate brackish water in the range liked by Opae Ula, s...

Why not, do you want me to ask Bruno again?

By protist I mean, motile not phototrophic ones... or maybe euglena. This is the first time I see that in a brackish tank, but in fresh water without filter it's common.

It's a cloud of protists.

You got Neocaridina davidi.

I dont need other sources, a single example against a hypothesis is enough to take it down. I just have to illustrate my case with photos... tomorrow

Aloha fellow aquarists. In this tread, I will make a list of plants and algae compatible with Opae Ula tanks. For this, the vegetable should be able to live and grow forever at such intermediate salinity, so forgive most of mosses and ferns being green for month before eventually dying! Please reply...

First morning with opae ula. The bad new is that I cant see any of the +15 shrimps. The is that I dont see any corps either so I hope they are hiding in the substrate and under the rocks

I have dark green fuzzy clumps on my rocks, those are cyanobacteria and its only growing on mineral or dead material (like the oldest pieces or marimo balls), Hair alage (this is the one you see in my pictures) is growing everywhere, I dont know why and yet it can outgrow other algae/plants I think....

It just grow on it and your Chaeto isnt strong enough to repulse it, it doesnt grow on healthy plants/algae but I dont know what you can do to make your chaeto tronger.

Of course. My substrate is lava rock with some corals, I think it doesnt matter. The algae (only one plant) are: -Caloglossa beccari, sold as "red moss" for freshwater, I think it can be transfered from fresh to salt water rapidly because its a red algae witch are very good at avoiding cel...

When a crystal is colored by something (iron, copper), it's in very tiny amounth, so tiny it's almost impossible to detect without spectroscopy, I dont think it would kill shrimps. BUT beware of other minerals growing around your piece of aragonite, it may be way higher content of heavy metal.

Brine shrimp, Neocaridina davidi (wild and self-selected red cherry), malawa, Macrobrachium, and gammarus.