Anyone know if dry ice will cause any problems with water chemicals if its just in the sump area. (Not in water) does it give off any bad fumes? I know we can drink stuff with dry ice directly in it with no harm to the body. What about dry ice directly in salt water? I'm sure its a big no. Just had to ask. I'm going to try a bucket of dry ice in the sump area to helpo cool the air. Hopefully the tank temp will drop.