Slocke
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My iridis also losses scales regularly. I guess I need to keep repalcing more of my coarse sand.Unfortunately yes, I’ve had wrasses die by using similar substrate in my own tank.
You really want a fine sand (it doesn’t have to be truly fine) for the majority of your tank and if you want, I’ve had success in mixing larger sand in with my finer sand. My sand is about 3/4 truly fine sand and 1/4 a variety of more coarse sand.
My iridis shows some wounds from the sand but generally it’s not a huge amount and only 1-2 scales missing now. It used to be patches of scales that were lost but now I’ve made my sand finer it’s reduced it a lot.