Thanks TRITON 1.
Yes, local company built it for me. We have some talented guys here.
The silicone gluing was by the "German method" :
3-5 mm of black silicone between the glass plates for extra elasticity.
I have about 10 clowns. Planning on more.
No problems at all. It's a big tank and they are all over. some in the anemone, some in the elegant coral or euphilia. No clashes at all.
Moshik