How can I clean my Koi fish tank?

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laughoutloud_247

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I have a 29 gal. tank with glass marbles on the bottom, and a few plastic plants. I also have a bio-wheel 150 filter. The tank only has 2 Koi fish that are only about 3 inches long each. When I started the tank I used reverse osmosis water and let the filter run for a week before I added the fish. The day after I added the fish, the water turned very cloudy. Per my brother"s (the fish "expert") instructions, I didn't do anything or add any water treatments. He said the bio wheel will eventually clean the water, it just had to "cycle". Well after a couple weeks the water did clear up, for about 2 days. Now it's so gross looking you can't even see the fish. What can I do. The tank is not in any sun light and the fish are not over fed. What am I doing wrong? My daughter's betta (that was in a different tank) just died after living for 4 years, and she wants a Koi to add to my tank. But I need to get the water clear first.
 
I would dump some of the water out into a smaller container and put the 2 koi in there. Then take the plants out and dump the rest of the water outside or down the drain. Take all the glass marbles out and clean those. Clean your filter and even clean the glass. Cleaning the plants helps too. Basically, clean everything. Refill your tank, put eerything back in and I only wait about 3-4 hours for the water to acclimate to the same temperature as the water your fish are in now. Put your fish back in using a net, do not dump the old water into the new water. As for what water to use I do not know. You could also try going and buying some freshwater cleaner fish, like shrimp or a bottom feeder fish.
 
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