hi, there's recently tiny little specs sticking in my tank walls. so far I haven't seen them move at all but whenever i see them in any way, i always try to remove them. they don't look like snail eggs at all and when you inspect them out of the water, they have this clear hard skin and the inside of it is usually whitish yellow. any guesses what this is? could it be harmful in my tank? (btw when you crush them they sound just like snail eggs being crushed but I can't seem to think they are since they look so different.) sorry for the bad quality photo. they're so small my cam can't focus on them properly