It's my 5g soil substrate tank... right now it just has a tiny guppy fry and some java moss because my order form Sweet Aquatics hasn't come in yet.
I noticed this morning that the flakes (3 tiny pieces of flake) that I placed in the tank for the fry is uneaten... but stranger still, it's been floating for about 18 hours.
Upon closer examination, there's a film on the water. The film is clear, so a photo is impossible, but I'm affraid it could prevent gas exchange since I see some tiny round bubbles stuck under the water surface.
I did a 50% PWC but approximately 5 minutes later it's back.
I stirred the water surface vigorously with my finger, and I could see this whitish/clear stuff in the water.
The tank is filterless, and I'd like to keep it that way.
I don't mind the film, but I'm just wondering if it's harmful.
(tankmates for now, will just be some snails and plants, with maybe 6 neons or tiny tetras coming soon)