So today I went to clean the water in my tank, and there were two things growing up at the top of my tank above the water. They were oval and tan. They were made out of lots of small bubbles. When I crunched one open, it was crusty on the outside, but had a gel-like consistency in the middle. I am wondering what it is, and if it is harmful to my fish in the tank.
My tank is 10 gallons, and i have 4 guppies, 2 snails, a frog and 2 plecostomus. ( i know it is crowded....)
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