deases, cloudy water

Question
I just set up a new 16 gallon tank for my two growning fish (a pictus and a redfin, before they were in a 10 gal.). I set up the tank, and after a couple days i got another catfish, another redfin, and 4 tiger barbs. My bigger catfish passed away a few days ago after having him for 3 years. I took a look at him and it looked like he had ick. I treated the tank with ick killer for sensitive fish (i knew the catfish was sensitive) but it ended up killing my other catfish, plus the water is really clowdy. All the other fish are doing fine. I am going to change the water (24%) and do another dose of the ick killer just to be safe. None of the other fish show sighns of ick. I heard of the "New tank syndrome" and figured it could be that too. at the end of this month it will be week 8. so i might put some more fish in (no more pictus because of how sensitive, I might put them in a tank to themselves and some other sensitve fish too). I was thinking of putting in: 5 more Tiger barbs, and 4 Gouramis. I heard about this bacteria that grows on rocks and stuff that can keep amonia down, so I took some rocks from a different tank and put it in, plus I have live plants, could that have anything to do with it? How long will the fish I listed live for. Could the plants be causeing the water to turn cloudy, I used CLEAR WATER cleaner to make the tank clearer, not much luck, plus I did a 50% water change, still cloudy.

Another question...I have a Shubumkin goldfish (I think thats how you spell it). I got him about the same time as my older catfish (3 years ago). I had him in with another shubumkin, 2 goldfish, and a koi. after a week he was the only fish left in the tank. So i replaced them, same thing happened, then i replaced fish again and again, but he would always be the last one left, I probubly replaced over 100 fish that could go with him. So I heard that they can make some sort of acid through their waste and scales. after i gave up replacing fish I put him in a 1 gal., then a 2 gal., then a 3 gal., now he'se in a 10 gal. again and is getting big. How can I keep fish alive with him, is there a secret?

Answer
Not sure your questions......I'll answer the ones I understood

The water will always be cloudy in an uncycled tank. You are sticking it too fast. You must get fish slowly to allow the bio-load to keep up. The rocks and the plants were a good idea, they will help.

4 gouramis will not go in that size tank. 1 or 2 would work but there is too much agression beyond that.

Either way, the gouramis will not go with the tiger barbs. They will rip there fins to pieces.

Yes, there is a secret to keeping them alive. Get a 500 gallon pond and stop torturing the poor things.

-Nick