I don't think the mushrooms are a problem - I have heard of others having them and I actually really like it! But I remember hearing something about snails in a terrarium being bad but I can't remember why. I was waiting for my 55 gallon to grow in before putting the darts in and I just recently constructed a top which caused the level of humidity to rise. 2 days after I noticed lines everywhere in the humidity on the glass and didn't know what it was - sure enough I saw a little baby snail. If it isn't a problem I don't mind having them in there.
Thanks!
Justin
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http://f2.pg.photos.yahoo.com/ph/dubaliscous/lst?.dir=/Pablo(Picasso panther chameleon)&.src=ph&.order=&.view=t&.done=http://f2.pg.photos.yahoo.com/
1.0 Picasso panther chameleon (Pablo)
0.1 Bearder Dragons (Mic Dundee)
0.1 Red-eyed tree frogs
1.0 African side-necked mud turtle (Wrinkles Jr.)
0.0.2 D. Tinctorius (Cobalt V.) Dart Frog




I'm glad that is the only tank with a snail problem.