If you do start to see bleaching you have to identify what is causing the problem , so it’s best to start with the basics I.e lighting , water parameters , test for sudden changes in the clarity of your water , temperature, it can sometimes be where we place the clam in our tanks too , also feeding some particulated foods can also perk up your clam if there isn’t enough food being produced by zooxanthellaes so a little extra can go along way sometimes , and raises your chances of your clam surviving , as it’s still early days , I’d keep a close eye on your clam try not to panic and if you see any signs of bleaching start with the above mentioned basics , hope this helps ��