sure looks like dinos to me mine started out on the sand but eventually it grew on the wall like a brown stringy spider web
Look for coralife turbo twist. I have one on my QT and a larger one on my DT and they are compact but work great! And they don’t break the bank
We just installed a Coralife Turbo Twist 3x 9w in our redsea 300xl to get a diatom outbreak under control and prevent future pests.