On the subject of the Duncans, don't panic yet. Firstly are they getting a decent flow, they like that. Secondly they like to sulk to when newly introduced to a tank. I would think that the heads are not fully expanding yet and as such it looks a lot smaller.
Also feed them every day if you can, really important for Duncans. Within a few weeks they will be lovely for you. I feed mine about 6 days a week now, lovely big head. (oh my that sounds)
On the subject of your delivery, what we can see looks lovely, I have those top zoas, if you put them higher up they get some purple on them.
Sorry to hear about the computer, I am having my own troubles here, may have to buy a new monitor if PC World say its not the tower. Not happy that on a pc cover your monitor is not covered.
thanks for the info TI & Rob
um the pc was a bit of a PITA and unfortunately it’s a one off custom built by my son so no guarantee {wouldn’t be guaranteed against a bag of water from the frags getting dropped on it any ways

any way back on subject can I ask how big can I expect each head to get? How big are your duncans heads TI?
I have the Duncan high up on a ledge with loads of flow. Here’s a pic of it today just after lights on...
Blue lights on for about 1hr.....

5 min after main lights on

Hope you like.....