Man, I'm realizing even after all my years of fish keeping, 10 years+ that there's alot more to worry about than I thought.
So in my 30 gallon that's cycling, I just put in the heater I got today. While I was doing so, I noticed on the glass there are tiny 1 centimeter or so worms crawling on the glass and twisting around in the water.
I first noticed them in my 10 gallon, and I guess I didn't think to much of it, don't know why.. must have been busy at the time. So I'm thinking because, I took the old filter cartridge from my 10 gallon to seed the new 30, maybe the worm like things transferred?
I have no idea what they could be, but I hope it's nothing serious.
Also one of my red eye tetras found one in the 10 gallon they're in and ate it.