I suggest to you that if you want to take a long term investment for your 6 coins it's better to store in on their own wallets not on the exchange websites because exchange websites sometimes has a problem regardings on their exchange like hackers entered in their servers, I have 100% trust on real wallet depends on your coins not in exchanges so many investors complaining on any exchange that their coins has gone without any permissions of real owners better to store it in real walet and when you want to sell it transfer it on exchange websites.