depending on what type of loach you have... yes your loach will eat them if he can get to them/figure out that they are food...
(theres a few hundred/thousand species of loach so you might want to be more specific.... i can assume its the one in yer avatar... but.... when you assume.. you make an ASS out of U and ME)
the best snail for brown algae is the gravelvacsnail... its often made of plastic and comes with a long tube.. a bucket is sometimes required but if yer mind is in the gutter they are good for breeding.. also the lessoverfeedingsnail is great for getting rid of algae..
i have a mix of pond snails, rams horn snails, trumpet snails and some other snail that i cant remember the name of that looks like a cross between the ramshorn and the pondsnail... (i was breeding them as puffer food but its gotten a lil out of hand.. i think im going to get some loach for my
75 once i finnish playing with it)
if you go to petsmart/petco 99% of the time they will GIVE you snails since their plant tanks are almost always infested with them... (offering to get them yourself or to pay a penny each helps.. and no one is going to have you pay a penny each cuz they have no way to ring that up... dont forget to Qtank yer snails.. they can have some funk just like feeders and such.. some will call that overkill.. but better safe than sorry)
fyi dr joe sent me here... im having fun with algae.. but mine is green... (see the 75 link)