Thanks to everyone for your help. I do appreciate it.
An update of how things are going and what I've done with my tank after receiving everyones feedback.
I've added that 'marine pure bio filter' at the bottom of my sump and then put the bio balls back over it with half the balls underneath the water the other half out.
ive added Over 20kgs of live rock so now there is over 30kg in total. I've removed all the creatures that were hiding in the live rock including some large round star fish with like 5 long spiky legs.
Just before I did add the rocks I took some water back to my LFS
and they told me everything was fine... In saying that I did ask them to use a cap when testing the water since last time the guy just used his finger when shaking the tube to mix it (not sure if maybe that is why it showed ammonia last time they done the test, but this time I noticed the test for ammonia was a lot less brown) I've also added a skimmer to my tank last week as well. And had the water tested by 2 different people and both said everything was perfect.
So hopefully this time round I'll have no issues adding new fish. I was told I should wait at least 2 weeks because the new rocks I've added will 'spike' the tank again.
What I wanted to know now, is that now I'm thinking of adding corrals or anemones... What is easier to maintain Corals or Anemones?
Or should i wait and add fish in my tank then slowly start adding them or should it be done before I add fish? Also is 1 white and 1 blue light enough for the fish/corals/anemones?
Thanks you again