A few days ago I added 10 RCS to my 20g long tank. Acclimatized them and they seemed to go ok, with all of them colouring up nicely and swimming around. Fast forward to today and I can only see 3 (admittantly there could be some hiding behind some driftwood where I can't see...), however I have noticed 4 (I am 90% sure) sitting around. Also in the tank are 9 neon tetras (added at the same time) and a whole bunch of MTS. The tank is moderately planted. Few questions: 1. I think 3-4 of them were pregnant, would they go into hiding if they were? 2. Is it normal for so many to moult at once? If they did moult are they hiding? 3. Are they all just hiding/sitting behind things? Would the neons eat them? Ammonia and nitrites are at 0 ppm. Nitrates were at ~20 before a 15% water change yesterday. Thanks.