Hunt however you want (with an ethical take) and ignore anyone who tells you otherwise.
Treat this exactly like SCUBA. You need to observe all the same safety, probably with more awareness as it might feel like your freediving- you might easily do rapid ascents etc. Calculate bottom times etc. The greatest risk IMO is rapid ascent and air embolism. If you're staying around 30' then there's little chance of DCS, but follow SCUBA tables and you will be as fine as can be.
ABSOLUTELY DO NOT HOLD YOUR BREATH AT ANY TIME ON COMPRESSED GAS OF ANY KIND, EVER!! That's the Open Water SCUBA course in a nutshell.
Maybe consider a refresher SCUBA course or at least read the manual again.... you have forgotten some of the most important aspects my friend. Learn how to do a controlled emergency swimming ascent from compressed gas diving.
Compressed gas is dangerous so please be careful
And let us know how the hunt goes.
