Albino BN don't get over 3 inches generally. Clown plecos usually are around 2.5inches. Don't know why these wouldn't be ok in a well filtered 10g tank (it's not like plecos are particularly active fish)
the minimum tank size for a clown pleco is 20g and for each ADITIONAL clow plec its an added 10g and ditto for the bristlenose pleco
if i am not mistaken
My L144's are smaller than normal bristlenose and I would not keep any in a 10G tank. Bristlenose are always on the move, and there's just nowhere for them to go and they'd have very little biofilm to eat.