Not trying to sound like a smart A but wont a lid stop most evaporation
Yeah - it should. But depends on how often the lid is open & how large any holes are.
I've seen him keep Bonnet heads in that tank/pond... Very nice indeed
Well depending on the dimensions - a 10,000 gal pond/lagoon might be ok of a Bonnethead. But IMPO this would considered near minimum for a single adult Bonnethead