Very much a newbie but have a couple of questions

Hi All,

Been lurking here a couple of months or so and picked up some great info....

5 weeks ago I set up a Nano Reef tank in a 15gall tank I had lying about
doing nothing....been keeping freshwater but wanted a new challenge....

Everything comes in pretty well with the tests I've done to date - got
more kits ordered but right now:-

Temp is around 80F - a bit high but the idea is to put some fans into
the hood
SG has crept up to 1.026 but from people I've spoken to this is OK for
Corals
pH is 8.4
Alk is the higher range of normal (sorry just a colour chart)
NO2 is 0 - has settled so the tank has cycled from my FW experience -
only had a small reading....

The tank is set up with a protein skimmer, a couple of powerheads and
around 9 Kilos of LR.....

Lighting is currently two 15 watt tubes - one actinic - another 15 watt
will be added tomorrow when I get my delivery from my mail order....

The livestock so far consists of:-

3 Blue Hermits - all have moved on shell wise since introduction
3 Nassarius Snails - want to add more
2 Cleaner Shrimps - both have moulted since being added
2 Feather Dusters - one brown and cream, the other pink
A colony of White Star Polyps that have rapidly become a massive bush
Some Green Mushrooms - not happy initially but have done better since
moving them lower in the tank

Every 3 days I am adding a small amount (2.5ml) of Phytoplankton....

The glass and substrate is getting a covering of diatoms which is what I
would expect - nothing severe

I'm emptying the cup from the Protein skimmer either daily or alternate
days depending on how full it gets.....

Water smells good....

I used RO water to set up the tank and am continuing to do so....I do
need to top it off tomorrow but can't lift the RO water container
(feeble girlie)

Two things are going on which I would appreciate some help with:-

1. I have noticed that the water surface is covered with pink dust like
material - this has happened in the last couple of hours....looking
closely it seems to be like mini White Star Polyps - is it? or should I
be worried....

2. Something nasty seems to be lurking in the live rock.....the live
rock in question is the one that the White Star Polyps are
populating....it is worm like....it has two horn like bits....it peeps
out sometimes and before the polyps carpetted the rock I'm sure I saw a
worm like thing dive across the rock and hide in another hole.....last
night I noticed something interesting in the substrate and gave it a
poke (wish I hadn't and had been more patient) - it floated towards the
white star LR and something popped out, opened it's jaws and gobbled
whatever it was up in a brutal way.....could it be a bristle
worm?....how can I remove it? and should I remove it?

The tank will eventually house a couple of Clown fish - no other fish
(young children, wouldn't be allowed to do anything else) - I've spotted
a breeding pair which are tempting me but if I have something nasty in
the tank as far as I can see the fry would be mincemeat so little point
in spending the money

TIA
Gill