Nice design; I am thinking about the same design for my nano tank. Visiting CR soon!
I always have the feeling that black silicon is stronger than white (is all in my head); not sure true or not.
Anyway, will your chiller having heat problem in the cabinet?
Chiller needs to draw in air and expel hot air, yes?
Yeah, you may need to have auto top-up for peace of mind.
Cheers!