Thanks for all your input chaps.
This situation reminds me of an apocryphal story I heard once. In a gardening book, under "How to grow potatoes", the first item on the to do list read:
1. Dig a trench 9 months ago.
We are where we are I suppose.
Anyways, one of my restrictions is budget. I've already used up 2 birthdays and xmas's on this project. So I haven't got the budget to have Andrew bespoke a set up for me. Much as that would be fantastic. Also, of course I've already invested a large amount of money in the aquarium.
I really like the look of what I have now. The aquarium has a great lighting system and I think it currently looks extremely cool, not to mention rather pretty.
I really want to keep the look and feel of it as it is. I think I've probably got current space to last me another 9 months to a year. But, dealing with this problem in a year is going to be considerably harder than if I deal with it now (Soldiers!!!)
I could feasibly add more nests inside the aquarium but I need to be able to access the water biome to trim plants, remove dead fish, etc. So I can't just load it up indefinitely. So I need to start thinking about expansion in some other way.
As I say, I've got the tank and I love it so any solution is going to be best if it works alongside the existing.
I also want to retain the Atta rather than swap to Acro. Among other things they are like my little pets now. I sort of love them.
Option 1) Put a (furniture) unit next to the aquarium and stand glass/acrylic nests on it - initial questions still remain, how would I best deal with climate control and would they naturally migrate to the new chambers once the nesting boxes in the aquarium were full. (see previous diagram)
Option 2) Andrew can design and build a unit for me that sits on the floor (or on a unit) next to the aquarium that looks fantastic and would fit into a space 108cm wide x 90cm tall x 45cm deep (or 65cm wide x 126cm tall x 45cm deep). And would either link to the existing aquarium or I just move the whole lot into it and just have the aquarium as an aquarium (although I do like the dual biotome) ?
Option 3) I can't think of an option 3.
Thank you so much for your ongoing help. Maybe if I'd had this forum to consult from the very beginning we wouldn't be where we are now.
It's great fun though isn't it