What are these?

[libingboy]

I keep getting these transparent round items with a yellowish core on my aquatium glass. They seem to appear the same time as when i get planaria outbreak. I tried to get some photos.
I thought they were snail eggs, but my tank is bare and i dont see any snails around. Theyre relatively easy to remove via magnetic glass cleaner.



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[Aweshade9]

do they move?

 

[libingboy]

No, they dont.
Its quite easy to remove them from glass. A slight pressure will destroy them, although there is a bit of resistance at the middle where its not transparent.


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[Aweshade9]

I dont know. Maybe they are parasitic eggs that hatch outside the host body. The planaria may weaken your fish's immune system and the parasites thrive. That or snail eggs, and the snails live in the sponge or something.