If you've only got 10 snails, then leave it at 2 assassins.
Whoops, agreed, I missed that bit.the_lock_man said:
Feeding less (rather than less often), would help reduce the snail population explosion. Clown Loach may work quicker than your assassin snails.
The first sentence, yes absolutely. The second sentence, no, clown loaches are not suitable for a 45l tank.