Ok asking because I did a wc on my Dads tank, scraped algae of the side. Took some of his gravel and an ornament and filter pieces to help cycle my tank. Later when I got to my tank I have these little things
When I went to check his tank he has it too. My guppy in his tank had little spots on his tail, I went ahead and put him down, bc the night before he was kind of floating at the top with kind of bent spine not eating a lot.
And this is what they look like in my Dads tank, a little harder to see but if you click on the pic may be able to see a little better
Would be awesome if I were just overly cautious and they were very little bubbles but I haven’t noticed them before