(I provided a 10" square area of 7" deep sandbed and it was not enough either), it ended up burrowing frantically everywhere.
i disagree with this statement sorry :-( i feel that if they didnt stay in their hole it was due to something disturbing them or due to their nervous temperment u have to turn your lights off and leave an 03
on for 30 min so they can settle down and sleep (mine at that time grab a small half clam shell (found on the beachs everywhere imo
ya cant have enough of these for these guys!! which i add a small hand full every couple of weeks to keep them busy building ) and covers the opening to their hole and gone for the night no worries )!! once they have the home they want they tend to stay there !!
i have had 2 yellow head in my 90 for almost a year now and they have started to spawn and they only have 4" of sand !! just added a 3rd and its settling down now been about a week !! but ive found that they all will hide for a week or so then want to be in front of the tank so they can see you and everything else movin around !! as for aggression as long as things stay a few inches from them they could care less even with the new yellow head which is way smaller !!
have had these before and would be able to keep them for a while and things looked good then one day they be all freaked and or jump out !! and imo
it was all about who and what is in with them and all about turning the lights off slowly !! and i think keeping them busy with diff kinds of shells helps as well !! the wife thought it was kinda silly to buy a fish she thought she would only see its head all the time but mine our out more than they are in there holes
and now their her favorite