In article , do do
wrote:
I am planning to put old tyres out for peeler crab and hope someone can help
me with the following info.
Are ridge tiles better than tyres?

Probably, or a length of gutter. Whatever will stay put in your local
tides, some people swear by a section of corrugated iron.

How long will it take to establish themselves?

Only a few days at this time of year.

What ground is best, sand, mud,stoney beaches. Are river estuaries any good?

All of these but sand/sandy_mud is easiest to work.

How often should they be checked?

Every tide.

Cheerio,

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