Platies hiding together and Transparent Molly?

Hey guys! so I've just upgraded to a 90L tank and I check the water and everything was normal so I swapped my 38L tank fish to this new 1 which was 8 black neon tetras, 3 Molly and 2 Platy but today I've noticed that both of my Platies (makes called Aqua and Moomoo) are huddled up under a log and its almost like Moomoo is protecting Aqua? and yellow Molly has become transparent in some places? I presume the transparent is stress from new tank but I'm concerned about my Platies because they've never done this before. I'm hoping it's just because of new tank but I want to be safe. They were swimming around fine thismorning

Update: I cannot find Aqua now who's the one I'm most concerned about, Moomoo is swimming around but Aqua us hiding and I cannot find him

found him as I posted that he swam up after I put my hand behind the tank and seems his normal colouring and shape but already hiding again