You should not be keeping an albino and a black red tail shark together as these fish will become increasingly aggressive towards each other as they grow and will probably end up killing each other, also the weather loach will not thrive in a tropical tank as it is really a coldwater/sub-tropical loach that needs a deep soft sand substrate to bury itself in. You have a lot of shoaling fish which you are not currently keeping in high enough numbers, i would personally advise avoiding buying any new types of fish, but instead sorting out the issues in your current fish stocking.