I got these new plants from Walmart just a week ago ( Monday ) and I did some research saying to water them once a week so I waited until Wednesday to water them. The research told me to water until water came out of the little hole at the bottom which I did. I think I should have cleaned the water that came out of the hole but I didn't. No where did it say to do that and by the design of this pot I thought it would just go back into the soil. Now it's a Monday after I got these plants and I just noticed this thing growing from the little hole where water should come out. I have no idea what this is or if this is hurting my new plants and I am very scarred right now. I touched it and it was very wet and slimy before I washed my hands. Could someone please tell me why this happened and how to get rid of it please? This is my first time taking care of cactus and a succulent so this is very distressing for me. Thank you for reading this and helping me out if you do.
Edit: Thank you all for the tips with watering my new plants and the growth turned out to be a mushroom that I believe was already in the soil when I got it. I think I was freaking out so much is because that side of the plot was facing away from the window and for some reason I thought it was a pebble. I wasn't able to take a picture of it but I found a photo online that looks similar to the one in the pot. Again thank you all for the tips with taking care of my new plants. :)
( those are also around the same size as the one in the pot )