New Clean Up Crew and Diatom (???) Questions

I have been having some minor issues and i was hoping to hear some of your opinions.
My tank is 7 weeks old. All of my levels are perfect, with the exception of phosphates are at .25. I am in the process of trying to find out what raises them...
So my question is. i have been getting brown speckles (algea of some sort) on my sand. I think they are diatoms. I believe this is normal in new tanks and is just part of the process(???).
I have a small clean up crew right now, 3 turbos, 5 red legs, 5 or 6 astreas, and 3 nassarius. I have contacted reefcleaners.org and i am planning on ordering a custom clean up crew they made me(this is for my 55 gallon standard reef btw). The crew recommended by them consists of
50 Dwarf Ceriths
15 Nassarius
18 Florida Ceriths
9 Large Nerite
11 Small to medium Nerites
Will these snails and my much larger clean up crew eat the diatoms (im assuming they are diatoms after doing research) off of my sand? its not a major deal, just unsightly.
Also, i do a 6 gallon water change weekly (a bit over 10%). i was told that 10% 2x a month was a good rule of thumb. is 10% weekly too much?
and my last question, will a larger clean up crew help me bring my phosphates down naturally?
thank you so much for your input
JP
(attached is a pic showing progress on my tank, but not a shot of the brown stuff on my sand)

 

Not using RO is the most common, but food will also contribute.

Yes, diatoms consume the silicates in a new tank.

Yes, most snails will eat diatoms.

No, the only way to do it naturally is by letting algae consume it. You can also try a phosphate removing media.

 

thanks mike.

 

the diatoms generally go away on their own...

 

Okay i got some pics. Are these diatoms???

 

They do go away after a while. Just cut down on the lighting. Mine are going away and I dont even have a clean up crew

 

there is a product called red slime remover its a powder kinda price but i had good luck with it also u can put phosphate sponge in your filter or make a sock for your overflow out of it

 

Nice anenome Indiana boy

 

Thank you, Jaws. However it's a long tentacle plate coral. I am trying to be patient and wait it out before adding a nem. Thank you for the compliment nonetheless.