It's not a stupid question at all...
Well, it's a small plastic tictac box. I've got two sizes of them. And I've got a glass container which is bigger. Those fish are more relaxed that way which makes making pictures much more possible.
I've asked a good buddy of mine who works in a glass factory to make two sizes of glass containers for me. For now, with the plastic containers scratches in the containers are visible.
Devoted aquarist ever since early 1970's...
Specialized in livebearers &
specific breeder of rare livebearers...