One thing you'll learn in this hobby is nothing good ever happens fast, and that includes cycling a tank. Live rock is great for jump starting a tank but as you're starting to notice it isn't without its down sides. For this reason most people now a days choose to start a tank with dry rock and live sand. Makes for a lengthy cycle but it avoids the hitchhikers we all hate all together.
So far by your pictures I have seen (that I can positively ID)
Glass anemone
vermetid snails
spirorbid worms
All normal hitchhikers and not end of the world scenarios. That's not to say you won't have to deal with some of these as they will impact your corals down the road. I don't want this to come off as discouraging as most of us including myself have dealt with all 3 of these even though I started with dry rock and dipped all my corals. These can enter your tank in many ways frag plugs and hermit/snail shells so don't second guess your live rock choice.
My advice, test your tank and keep it as stable as possible. Enjoy all the creatures in the rock. It is an incredibly wonderful feeling discovering new life forms every day. Take note of them, take pictures and do your research. If you can't take pictures of them sketch them on a piece of paper best you can for identification. Remove the bad ones and keep the good ones but above all enjoy the experience.
So far by your pictures I have seen (that I can positively ID)
Glass anemone
vermetid snails
spirorbid worms
All normal hitchhikers and not end of the world scenarios. That's not to say you won't have to deal with some of these as they will impact your corals down the road. I don't want this to come off as discouraging as most of us including myself have dealt with all 3 of these even though I started with dry rock and dipped all my corals. These can enter your tank in many ways frag plugs and hermit/snail shells so don't second guess your live rock choice.
My advice, test your tank and keep it as stable as possible. Enjoy all the creatures in the rock. It is an incredibly wonderful feeling discovering new life forms every day. Take note of them, take pictures and do your research. If you can't take pictures of them sketch them on a piece of paper best you can for identification. Remove the bad ones and keep the good ones but above all enjoy the experience.