In the first photo you can see what look like the head of a cotton swab, with a small funnel-like mouth. These are between 4-10mm long. I have about 200 in my sump attached to the bottom and sides, and a few in the tank attached to live rock.
In the second is a white branching kinda thing...
I am currently setting up a closed-loop for a 125g acrylic tank.
I have completed the intake side of the loop by drilling the back and installing 2 x 1.5" bulkheads with strainers. These are plumbed with rigid PVC and come together in a true WYE. The WYE has a ball valve, union and then a...
Within Manhattan...
New World has the best coral selection. It's not great. They are usually have a decent offering of LPS. Lately they have started to bring in more anemones, corals and clams, but still not much to speak of. They have a good and generally very healthy fish and invert...
How much flow are you looking for? If this is for a 55, I can't imagine that an Iwaki is too loud. I have two Iwaki MD30RLTs, and they are practically silent. I also have an AMP3000 and it is also quiet, but not as quiet as the Iwakis.