Work in progress, step 3

Thank you for posting! About the troubles above, the branch you can see is an 'aquarium type' one, then it would not rot; however it doesn't touch directly the water. Therefore, to avoid the odious mold, i predisposed a little internal air-recirculating ventilation system, and since i activated it the mold went away! I’m still proving this, and i hope it will go on this way. If you need, i can show it to you.