Disclaimer: All of this is due to my incompetence, so no, hydra didn't come to my house and rob me.
So I had a little 10g tank that had some plants in it (the main one I'll be talking about is some parrots feather I got. Now, I cannot confirm nor deny this was actual parrots feather, because there are so many species that look like parrots feather and hornwort and...ugh its making my head hurt. But anyways, I had a little HOB and a sponge filter in front of the HOB, catching the flow on the way out. The parrots feather was catching the bubbles and the flow between both the filters. It was a kinda new tank (not really though, the bacteria wasn't at least), and it started growing some kind of algae on the very fine leaves of that plant. I hear a lot algae is not necessarily bad unless its killing the plants, and I thought the couple of cherry shrimp I was planning to keep would benefit off of it, and I would just leave it there. Big mistake. Fast forward 2 or 3 months and it was a a lot thicker and small and black, just coating the plants. But I was still in denial. I forgot to mention, the algae was some staghorn algae. But I didn't know at the time. With the tons of pond snails I had, they were creating a ton of molm and poop in the giant pea gravel I had (that I recently covered up because I couldn't plant any plants in it), and from that there were a bunch of small cyclops and copepods, and Im assuming from that, there were a bunch of hydra. About 2 months ago I finally gave in and looked into what it was. I read that it can be treated with Seachem Excel or increasing flow and it was from a lack of CO2. I also heard it can kill Val and Anarchis, both of what I had. I figured I'd do a plant dip, and took out all my regular baby tears, which was barely growing in sand, and parrots feather. It didn't really do much but turn white/gray on me and I decided to cut everything off, and now the Baby Tears just stands out more. From there I watched and learned about balancing your tank (probably the video from Girl Talks Fish was the most concise but anyways..). I just added some plants, covered the gravel and heavily gravel vaccumed (not that much actually, and a lot was in my HOB, which is a Tetra Whisper 40 literally filled to the brim with sponge. Literally. It died down a little and now theres only a wall or 2 covered in it, but I assume theres still a lot in the algae- some I still have in my java fern or whatever else plants. I wanted to add some fish live livebearers (I was already planning to add some platies) but then I figured that since it was a 10 gal, the platies would not let the shrimp at least make a baby or 2. So I figured I would put some shrimp first before the platies. But then I remembered the hydra and it was back to square one. Anything I should do? Also, anyone have experience battling Staghorn Algae and it turning really short and thick, but stringy enough to not look like BBA? Honestly I just want to cut off all of the affected plants, add some new plants and forget about it.