first indoor medical mj personal grow [pics]

I'm new to this but I have been doing a ton of reading.. and getting help from a fellow patient who grows for himself quite a bit Any input would be nice on anything i should change...

My setup is as follows

Light: 150w HPS (small i know... but good enough for my smoking needs)
Space: 4x2x5
Inlet: 6 inch fan pumps air into the tent I built... then vents to the attic.
Soil: Fox Farm Ocean Forest
Nutes: Fox farm trio(but the plants didn't like the nitrogen rich grow big so they were on big bloom for the most part only... now they are getting 1/3 doses of tigerbloom.


Today is officially the first day of the second week flowering

Oh yeah they look like hunchbacks because i'm LSTing them and they haven't been LST'd very long

so you can see better

Lookin' VERY NICE! Keep it up and good luck !

Peace

My friend told me to get gravity/snowstorm/MOAB... which I have purchased but after reading a bunch i'm not really sure if that is a good idea... especially with soil.

Even if I use MOAB in smaller amounts am I still risking making the PH in the soil go haywire and get salts building up?