Looks like a classic bristleworm to me. I've seen a couple of nature facts sources call them fireworms, but those aren't the fireworms that people are afraid of, the big honkers.
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Reduce white light intensity or even turn off the whites for a few days and pull as much as you can by hand and add some snails- Turbo, astrea, nerite, trochus and nassarius and a 1/2 dozen blue leg hermitsUpdate on the GHA explosion impacting my dry rock. It’s very clear that the ugly stage would be considerably uglier had I used nothing but dry. Any spot of rock not covered by coralline has an intense hairdo of green algae. Grabbed some photos prior to rearranging and scrubbing of the dry rocks.
Going to do a brief blackout following the scrub down to keep the GHA at bay while I wait for my CUC to arrive.
Score another point for the live rock - pretty sure I’d have barely any pest algae if I used all live rock rather than mixing in the dry.
Post cleaning & rearranging
I would take a fairly calm approach to the hair algae, like you seem to be doing. Dim the lights some until your cleanup crew gets here, scrub the dry rock (but not the live!), and that's about it. Once the cleanup crew is in, don't scrub the dry rock at all, let the good algae get established, Just pull the long stuff by hand.
Cute little gorgonian. Looks like some of the photosynthetic ones, which is good news for its survival. Nice find.
Have you checked the tank at night with a red light to see if you can spot anything cool and/or potentially problematic?
This is really nice looking rock!! I have been eyeing there website to order 60lbs shipped in water. I have a rsr250 and was set up with all Marco rock and boy never again. The Dino outbreak is out of control after multiple treatments and adding a UV. I’m just done with it. My plan is to restart tank with all live rock from KP. Did you get your rock shipped in water or paper? If water do you remember what the airline cost? Would you order from them again?
I think it can give you a more realistic scape though. Plus, with dry rock you can create the overhangs and such, and then mix in the live rock.So I did end up shipping in water and it's safe to say I'd 100% do it again. I ordered 40lbs of live rock and had 40lbs of dead rock already in the tank (I also got it from KP). I paid about $70 at the airport for two boxes.
After doing some research, I don't even thing I had a cycle in the tank. I ended up finding out that my test kit always read a bit of ammonia in salt water (.25ppm) and my tank never showed more than .5ppm and that was right after I put the rocks in.
The only detractor I can really say about the live rock is you really can't get a cool aquascape with the appropriate poundage of rock. With the negative space aquascape craze and various other interesting approaches to establishing the tank, it makes ya feel a bit like you're missing out when you can really only stack the rocks. I didn't want to break apart the live rock and risk killing anything, and was mostly concerned with preserving the life rather than making something look unique.
If I could go back I'd probably take the same approach, because it's not about how the tank looks with rocks but how it looks fully stocked with coral & fish. If you're really into a cool scape, with various plateaus and overhangs, you're not going to achieve that unless you're willing to break apart the rock when it arrives and use rods / glue to keep it all together.