There is 2 big goldfish in my tank (4ft by 1.5ft). They have a lot of black patches on heir body but I just changed the water few days ago. I always change my water one a week (about 1/3 of the tank's water).

I suppose the parasite comes from the frozen blood worm I fed them (once a day). I just added another half packet of salt into the tank to control the parasites and hopefully cure the disease.

In the future I will add some salt into and mix the frozen blood worm with water before pouring it in to the tank to kill any remaining parasites first so they do not thrive in my tank.

Any comment regarding my goldfish? I really need advice.

This post has been edited by j45on: Mar 4 2009, 11:15 PM

!!!

This post has been edited by j45on: Mar 6 2009, 12:35 AM

I posted this in another thread after the above.

Today is the second day after I did a dramatic change of water. Now they are all swimming fine except two where one big one that still upside down thus unable to eat but breathing normally now and one small one didn't made it.

I just changed about 20% of the water again today and throw away all the sponge and stones and replace them with new ones. I plan to change 20% of the water again on Monday or Tuesday. I have added 4 more small ones and one more big black one, total now is nine again. After changing water I added a handful of salt for that much amount of water changed.

I check the water pH and its at 6.5pH. The temperature is at 31 degrees. My tank has no carbon stone as my water does not smell as I will change my water often. I plan to put a wood which I put away last time but is afraid it will make my tank yellowish.

1. How to feed and cure the big one which is still upside down?

2. How to I stop the wood from turning my tank yellowish other than not putting the wood in it?

3. Is my tank temperature and pH level favorable?

4. Is a handful of salt too much for 20% change of water?

5. Should I rinse the blood worms with a little salt to kill the parasites before pouring it to feed the fishes?

6. Parasites from blood worm will be freeze or killed when frozen?

The big one did not eat anything but just floating at the end of the tank upside down. Today its more active and it is at the right side now most of the time. It takes longer to recover I guess. Tomorrow I will be changing the water and I will see how it is doing. I am just keeping normal goldfish.

Those big goldfish from China do you think they are recommended?

0.3% of salt is how much actually? The petshop owner say for about 3-4 inches of water change, you add a handful salt. My tank is 4 feet x 1.5 feet.

What do you mean by tawing? Wash with water is sufficient to remove parasites? Hikari frozen bloodworm no parasites? The bloodworm packaging I feed one is written with chinese word, maybe from China I will check and get back to you.

catch goldfish use net or hand better? Will they die if catch them with hand?

This post has been edited by j45on: Mar 9 2009, 12:26 AM