Albino cats (I assume that's albino cories Corydoras aeneus, correct me if I'm wrong!) need to be in groups of at least six and are, in all honesty, too big for your tank anyway.
The golden loaches (which will be either Chinese algae eaters Gyrinocheilus aymonieri ot weather loach Misgurnus anguillicaudatus) will also get too big; you could have pygmy chain loaches, but again they need to be in groups of 6+.
The pygmy cats could be Ototcinlus or one of the dwarf corydoras species, and would do fine in a tank that size, but again need to be in a shoal of at least six individuals.
The clown pleco is a bit big, but are quite sedentary and would be fine; you won't see it much though!
To help you choose, what fish do you have in there now, what decor/substrate do you have, and is your water hard or soft?