Orchids & Betta Fish? Idea, need input.

[bnaz]

Hi! Newbie with an idea, here. So here's what I'm thinking about doing...could you read through and tell me if I'll have any problems or if this is a good/bad idea? I'm thinking about getting a 5 gallon fish tank, lining the base with some decorative marble stones, filling it with 3 inches of water, and putting a betta fish in there. Pretty basic fish tank. Then (and here's where the orchid part comes into play!) I was going to put two (or maybe just one) mini Phal. orchids into the tank. Each plant would be potted in a bark medium in a clear cup with proper drainage. Each cup would be set within a square plant bowl (similar to the one pictured) lined on the bottom with stones. So essentially, each orchid would have its own little housing and drainage system. Each of these orchid's bowls would be set into the tank. The level of the water would be low enough that it does not reach overtop of the level of the plants' bowls and flood them, but also deep enough for the betta to be happy. (Bettas live in lower levels of water in the wild, so I do think this would be suitable--the area around the orchid pot would offer plenty of swim space.) Does this make sense? I was thinking it would be a unique/interesting way to give my orchids better levels of humidity while also indulging in my love of bettas. Plus, both bettas and orchids have a reputation of being hardy, tougher than the rest of their peers, so I was thinking it'd be a great compilation display.

Would it be best to close the tank lid, or might I get away with leaving it open? Would this promote a happier environment for my orchid then simply sitting on its humidity tray by my window?