Hello everyone. I have an odd question about a diy project I'm currently working on for my 10gal. The tank is currently fishless so I figured I could try an idea I had to make a maple bark cave for the ghost shrimp I want to add to it. I had this awesome piece of wood with bark that I thought I would hollow out to add to my tank. I boiled it yesterday for the majority of the day, changing the water as it became really dark. Around the end of the day it stayed sunk while in the water. I was ecstatic thinking....SUCCESS! Then the bark separated from the wood itself, still perfectly formed. I was even more excited since I didn't want to add that much wood to the tank. I took it out after a bit more boiling, ran it in cool water and placed it in the tank. It was in the tank for maybe 4 or 5 hours and I went to turn the light off before bed (light has 3 light settings, daylight, moonlight and blacklight- glowfish light led), I noticed when the light got to the blacklight setting my water that was perfectly clear (even in blacklight) is now fluorescing green. I took my mini flashlight which has a blacklight setting on it and shined it in the pot of water on the stove containing the other pieces I am treating and it fluoresced the same way the tank water is but a stronger color. What I'm curious about is will this hurt my fish or shrimp I plan to add to the tank or is this normal when adding non-plastic material like real wood? I like to add live plants to my tanks when I can and have never experienced this change before. I wanted to try shrimp as a new thing and wanted to give them something to "chew on" so to speak but don't want to do anything to kill them instantly. Boiling in regular tap water no chemicals. Thoughts?
The water in the pan I used to boil the 'bark cave' (the first 3 pics in the thread, it's in my hand) was way more vibrant than the tank so I'm thinking it has something to do with the tannins from the bark. I will be getting a test kit this weekend so I will be able to get numbers. When I discovered this anomaly, I thought of a witchs' brew, but the Dr Who reference definitely fits. 
There is more stuff going into this science experiment that I can't get til Fri, so hopefully between now and then I can figure out how to get some better pics for you all. The tank was deep cleaned and reset two weeks ago and has no life forms except some plants from my beta tank ( the plant split 9 times so I had some extra lol) and until last night (when I added the bark cave) all was normal. Filter and aerator have been running. I wouldn't think the tree it came from would harm fish since these constantly fall in our rivers. It's from a common maple tree, anything that was clinging to the bark came off in the first 3 baths it got. The bath (boiling) process started at 1pm and lasted until 8pm, water got refreshed when it became too dark probably once an hour. Sorry if the info is all over the place but I'm trying to get it down as I think to add it. And THANK YOU for being patient with me!
