A new semi aquaponics system?

[estación seca]

The method of keeping the roots moist looks good. The roots do get a lot bigger with time.

I agree, unkind to the fish. Plus, that tiny amount of water would have to be changed almost daily to deal with the large amount of waste a goldfish produces.

When you say your house is cold, what do you mean? Most Vandas are warm growers.

Added lated: That's also too small for a betta. I know pet shops sell tiny little containers but they're really not big enough.