Anchor chain length.

[baitable]

7m cat, 8mm chain (to go through lewmar winch) 23m of chain, no issues- more chain the better. We always try anchor on sand patches to avoid damaging the reef, that being said as we spear, we often help set the anchor. run AS MUCH chain as you can handle...

[Dignity]

I think 13mm is more than enough airlock, it would be interesting to see what everyone else is using on what boat?

Fed, 10mm on 5.2M Glass Mono. Considering going smaller.
Fed, 13mm on 6.2M Glass Mono. Felt like an overkill.
Airlock, 13mm on 5.2 Alloy Cat. Having straining problems, (what is that?)

Anyone care to add their numbers?

I've anchored with a treble hooked jig with 15Kg Mono line in 70M of water and a 1.5M swell.

Dignity - 5.9m mono, previously 8 mm, now use a Mooloolaba pick, no tynes to straighten and thinking of a Sarca due to some boat changes.

Seriously though with reef picks I used to make my own, take a large eye bolt, weld 5 tynes to the end, slip a piece of water pipe over the weld as far as the eye and tack it on. The end result was a heavier reef pick than a store bought one which I think is also part of the issue as the chain is more likely to foul the pick on the way down due to its light weight and adding the extra tyne made the anchor grab quicker and hold much much better but conversely didn't require any additional effort to pull up. Mmmm, this is making me think I could redesign the Mooloolaba pick for my next project.

[tunaticer]

13mm tines is too much for your boat.
10mm short sharp bend tines would better suit.
Let out more rope.
4m of 8mm chain should be plenty.
10mm rope should be fine.

Reef picks have changed considerably on how you bend them to how they were always done 20 years ago. Shorter tines bent sharply works better then big long arcs. It is all about leverage.
You do not need width for a reef pick you need shorter tines that are thinner but harder to straighten.