My 12G Edge was the problem.
Stock light - it is the tall tank with the 42 LEDs.
Low light no ferts to speak of. Went through a phase to see if the tanks could be run with fish poo and left over food type thing. Just coming out of that phase now as I can tell the plants are not all doing very well across the board. (Some are though.)
I got some plants from a fellow hobbyist and they were pretty nice and grew well for me.
There were 6 WCMM which were just about grown had them since they were so tiny you almost didn't know they were there.
2 Young Xiphophorus helleri Rio Otapa - Swordtails which were nearing adulthood but I couldn't catch them, the other 2 were in the 72G which I did capture.
And 6 of the so very awesome little nano fish Neon Green Rasbora, Microdevario kubotai. The only fish that were supposed to be in there.
Plants were
Subwassertang, Peacock Moss, Christmas Moss
Bolbitis Heudelotii
Cryptocoryne Balansae
Cryptocoryne wendtii
Java Fern
Guppy Grass.
Anyway the plants came with the Cladophora algae and I picked it off originally and it seemd pretty low amount, but I would have to keep an eye on it. Not too much Light. A couple times the tank light would be forgotten, it isn't on a timer like a year of time. Not a big deal. About 5 months ago in August I cleaned it up and didn't have it too badly, cleaned up pretty easily by pulling it off, slid off really.
But when my daughter watched the tanks when I was gone back in October, she forgot that light and it was on for 2 days straight.
That was enough to cause a huge increase in the Clado and that stuff was in every branch and leaf of the plants and I would be able to remove small gobs of it, but there were tiny hairs of it in all the plants material. Not a way for me to clean it up easily.
I had to get those fish out (babies in a grow out tank space).
Originally set up until I was going to set up the new Edge 12G tank but it was damaged and couldn't use it. So the tank that was to be a temporary set up for a few weeks - lasted a year and a half, but as it started to look pretty nice I left it.
So took down all the things in the tank and left the plants in a bucket for 4 days without additional light. Then just did a H2O2 bath night before, 3 parts water plus 1 part H2O2 for 6 minutes. Had a few spots of green spot algae and some on the edges of the top leaves closest to the top and light on the Anubias Nana Petite.
Wiped those leaves with the Mr. Clean Magic Eraser.
Was about a 10" length of the Anubias Nana Petite on a tall DW to cover the intake tube. the DW cracked so It had to come apart anyway. I didn't see the pic for the tank in the album may have one some where.
Pwc of around 1-2 gallons each week.
Here is a pic from last August before I cleaned it up nicely.
This time it looked similar but there was more than before in the rest of the plants.
The treatment helped, but I still saw tiny fibers, though hoping they will be dying off. It was recommended to me in a thread about the algae to just use Excel for awhile to get rid of the rest of the stuff.