I had a FOWLR set up in a 55 gallon tank until hurricane Charley decided to devastate charlotte county. The tank was destroyed and the live rock was tossed into the saltwater canal behind my house. I have started to set up a 90 gallon tank and was wondering if I would be able to use the rock that was thrown into the canal? If so should I let it sit in the sun for several days due to contamination? Or should I place it into my tank without worries? It is a SW canal by the way and the rock has been in there for 5 months. TIA