Well, these posts are real encouraging, lol. I thought I'd seen it all in my tank too, I've had egg babies, seed shrimp, algae, but this is new. Hmm, I guess I'll scrub some marbles and rock, rinse the bio-filters and do a better cleaning, even though the levels are all good. Maybe I should find a lab to look at this. I'm concerned it will spread to my other tank.
Thanks for the posts!
46 Gal. Euro, plant light
Undergravel filter, 3 cartridges
Hanging aqua tech filter
assorted tetras, 1 frog, 1 red-tailed cat, platies, swordtail