Having a lot of experience with artifical reefs
(10 years Volusia County Port Authority)
As well as doing my own habitats.
55 gallon drums do OK but they only last
at best 4 years. Likewise with washers, dryers etc.
Check with your local sign company, alot of times
they have big old signs and usually give them to you.
As Matt said the "Man" has gotten real strict
on this sort of thing..
No matter what you deposit just keep adding each time you go. Within 24 hrs life is already there..
Good Luck, Ken
PS: We can go into details at Long Point.