Been a bit! Here's where we're at.
I just gotta say the mix of Caribsea and pool filter sand I'm using from the previous owner is not my favorite. Yes it's easy to plant in but nothing is growing, or if it is, its at a snails pace. I've got these glosso root tabs that came with the tank (I think are just Osmocote in gel capsules) and when I try to stick them in under the plants they end up either popping on the way in or just break down and float all the contents to the surface of the sand. I'm also using half dose of Tropica Specialised ferts weekly. I'm thinking the exploded tabs are causing my problems...
I had a nerite snail in here about a week before it stopped moving, then finally fell off the glass one morning and was toast. I do water changes 2 times a week, so I don't think build-up is the problem. My only other guess is the photo period - I work 10-12 hour days. Guess I'll be buying a timer.
About a week ago I noticed yellowing on my Anubias nana, just one leaf, so thought it might be the photo period/deficiency of something. Then just yesterday I was unable to come home for 16 hours. During that time my plants in the center of the tank, Anubias nana, java fern, dwarf sag, all directly under the teeny LED light in the filter, turned black.
I panicked and thought it was the dreaded BBA brought in with some Limnophila sessiliflora I recently added. Then when I was trimming during the water change I noticed there was no fuzz, no slime, nothing to scrape off the leaves. They're translucent but still strong.
I was silly and didn't test parameters til after the WC. pH hovers around 7.2, ammonia is <0.1ppm, nitrites 0, nitrates <5ppm.
Anybody have any idea what this might be from? I trimmed all the affected leaves and started dosing excel again. Here's a poopy cellphone FTS - you can see the gap in the middle where I tore up all the dead stuff.
PS - Betta's doing great