i have 2 question about 2 tanks

Question
Hi Karen,
My name is Kim we have a 10 gallon tank that has been up and running for about 6 months or more. We have 3 fantail goldfish in the tank, we resently moved them from a 5 gallon which my mom had them in. I know a 10 gallon isn't big enough for them, we're saving up to get a 30-55 gallon for them. The tank came as a set with filter & heater included, we arent using the heater. The gold fish have been in the 10 gal for about 6months at least. Everything was fine up until now, now the water is all cloudy and its a white color it's almost like it happened over night. I checked the ammonia level and its fine, same thing with the nitrite, nitrates, ph,chlorine, alkaninity,etc. all normal. we do water changes 1-2 a week & take out about 10% of the water each time. Any suggestions as to what the problem may be?

Now for my 2nd question...

We also have a 55 gallon tank we've had it set up for about 3-4 months, we started off with 10 fish (2 mickey mouse platys, 3 dalmation mollies, 1 lyetail molly, 3 swordtails (1 male, 2 female),& 1 julii catfish.) All died but 1 female swordtail, & 1 mickey mouse platy. When we test the water the ammonia level is 0.5-1.0 between stress & harmful. We thought that the cycle had stalled and added 3 Gurami's (not sure of the spelling) per our petco specialist. the ammonia stage has been there for over 3 weeks we're not sure whats going on with it. The PH is off too, we do 10% water changes on it 1-2 times a week. I feel bad that we're lossing all these fish, can you help me try to figure out whats going on? The tanks been up and running with fish for 3-4 months now. and the ammonia is still there, but no nitrite or nitrate. I'm so confused :(
Please help

Thanks for your time!

Sincerely,
Kim

Answer
Hi Kim,
Sounds like a bacterial bloom due to a sudden overabundance of nutrients. This is common in high bioload tanks such as goldfish or cichlid tanks. The best thing you can do is to increase your water changes as much as you can. Daily water changes would be best actually for a while until the aquarium clears. Something along the lines of 30-50% would be great.It may not seem like its going to work. But after some time  (depends upon individual aquarium) the aquarium will eventually stabilize and the water will clear.

Now for the 2nd question. Again, the best thing you can do for the harmful ammonia levels is the daily water changes until conditions improve. Also keep in mind sometimes tap water itself can contain ammonia so check for that. This is due to the chloramine being used in many source water. When the conditioner breaks the chloramine bond, the ammonia in it is released. With this problem you'll need to use a water conditioner that neutralizes ammonia as well. Such as Amquel+ or Prime.

Sometimes certain water conditioners can produce false readings on your test kit as well. So be sure to check that also.

Best of luck! Have a good weekend!
Karen~