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HippieChick said:
Lose the aquarium as a FC .
A lot of contams come about because of poor FAE . A glass aquarium is not going to allow for proper FAE . The air will tend to be still .

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steampunker said:
1)  I will be growing some shrooms (B+ babay!) relatively soon, and i was wondering if there were any ways i could limit contamination.

2)  Ill be using the usual PF method with brown rice flower and vermiculite, I have a dozen half pint jars, a 15 gallon aquarium for fruiting, and i dont have a pressure cooker, because that costs too much.  Ill also be layering the bottom of the aquarium with perlite and water (should i boil the water?).

3)  Whats the chance of contamination after the mushrooms have already been picked? 

4)  ill be trying some of them wet and fresh, but i was going to be drying them using calcium chloride and storing them in the fridge.  anyone know how long i can store them in that way?

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I'll try to actually answer your questions ;p

1)  Make a glove box, and do your work there.  Or, attempt to recreate glove box conditions in the room you plan to work in.  This means still air (so no airborne nasty evil spores land on the food/space that your shrooms will be living in/eating)  Also, lysol/oust/alcohol/chlorine every surface/wall/air particle within the area, to kill anything else (including germies/spores) that want to attach to the food, and eat ur mycelium as well as brown rice. (goes for all other substrates as well)
But, as long as you follow the PF tek, you should be straight (you can steam the jars instead of pressure cooking...it works)

2)Boil what water?  Take a bunch of perlite and rinse it in a collander. Now, take the perlite and lay it in your aquarium, about 3 - 6 inches deep.  Thats it.  Some would suggest adding a bit of h2o2 (hydrogen peroxide) to the perlite for extra protection, but thats optional.
As stated before, an aquarium doesnt allow for much automatic FAE, due to lack of holes, so you will need to open the top and fan some fresh air in there a few times a day.  Aquariums are fine, they just aren't for the lazy. (plz clean it out/sterilize it before you use it, hah)

3)Molding on shrooms happens if you leave your shrooms to rot on the cake, or leave them wet and stinky for too long.  Fan dry them for a day or two after picking, then put them in a desiccant chamber until cracker dry.  You really should be safe at this point for a couple months, if stored in a dark place, but storing in the fridge would probably give u a few more months of shelf life.  The sooner they are eaten, the better (potency wise, and because shrooms love to get eaten and you should be there for them)

4) I answered this in #3 kind of.  Its a rough estimate, but just smell them before you eat them.  If they smell like rotten moldy shit, then oops...if they smell like shrooms, gobble up