growing on walls

Just noticed this article for a modular coral wall system. Was curious what other people thought of it and if it is worth it, or do people just use superglue etc? I like the idea of having GSP on the back wall on my overflow, however, I'm unsure how often I would need to trim it to prevent it...

Can someone tell me what is growing in my Sump tank? This is the largest growth but there are other spots. Should I remove it?

Anyone who has used cyphastrea as an encruster for your back wall, is it easy to remove when it encroaches on your rock wirk? I am getting a sweetheart cyphastrea soon and want to use it on the bacj wall but don’t want it to grow over my rockwork where it touches the wall and encrust over...

I want a soft coral to grow on my back glass, and I am considering daisy polyps. Are they controllable like GSP? I want a good grower, but nothing invasive like blue clove or Xenia. These guys are pretty and I've seen mixed reviews of them; some saying they can be invasive, others, the opposite...

What are these? They are all over the wall of my sump in the return section. The pic outside the sump is one I took out. They are soft and don't appear to be moving.