ID please

[dugthefish]

Snail like thing crawling across the glass, maybe 1/8"-3/16" long. My snails have been laying eggs all over the place, is this a baby snail?

 

[Crabs McJones]

Ghost flatworm. Not bad but unsightly

 

[Gareth elliott]

Not a snail. Aceol or ghost flatworm. Not necessarily dangerous but can populate to quite heavy numbers being unsightly on the glass.