I have read that the juice is toxic to pets but there they talk more about cats and dogs. And it's more about the juices. I can't find it toxins get released by the roots and neither if its harmful to shrimps. However they do behave really weird and I just can't get it to stop. I have even restarted the tank thinking that maybe something is wrong with the dirt I used.It looks like it has a toxin.
Haven't thought of that, could be. However the ficus is in the tank for a couple of weeks now and before that in a little bucket with water. So I guess that toxins from previous soil should be gone by now...It is more possible that it may have absorbed some toxins before in previous soil.
When I saw my shrimp almost totally inactive it looked like my dad when he had a thyroid issue. The thyroid in animals needs iodine. So I added iodine to my RO water. it only took an hopur to for the shrimp to return to normal. A small amount of iodine exist in tap water. So a water change should have added enough to correct the issue. Although plants don't need iodine they sometimes take it in by mistake. So plants in theory can deplete the water of iodine. And it is also possible that the food you were giving the shrimp didn't have enough. A 0.02mg/l dose of potassium iodide should be enough to prevent the issue.And at some rare moments I caught one eating but they remained almost totally inactive which was discouraging me. But after another water change I see several of them eating! I