Oh no, not another anchor thread!
I have a 65# cqr with 200' of chain behind it. It seems to hold my 29,000# boat just fine.
People have very strong feelings about ground tackle, I think the best advice is to have more than one and to have different types onboard for different bottom conditions. I agree that you should have much more chain than you are proposing, I prefer an all chain rode, you may always use a piece of nylon with a spliced eye and a carabiner as a snubber should you have the need.
Sailing a '74 Challenger 40' Ketch rig out of San Francisco