I know that the main 2 complaints are that-
1) You dont know when they die if you dont check them every few days, so your ammonia can spike.
2) They starve.
I think I can handle #1 by checking them, and #2, I will only have 2 clams in my 30 gallon tank. This, along with 2 snails, 10 shrimp, and 3 cordys will be my cleanup crew. That should leave enough for all of them.