Leonclaro,
I took some time this morning to read thru both of your theads and read every post. I think we we take all of the advice given and try to combine it into one post with a good and complete procedure for your water changes we might be on the track to work toward a solution.
First. What concernes me some is the range of the PH readings. You say your tank water has a PH usually just under 7.0 and your tap water is consisant at 8.4 or higher. I suspect your using a
PH Low range kit Just for conformation please take a cup of your tank water to your local
LFS. Ask them to check your water for you. Most places will do this for free. Make sure they test the following:
- PH Low Range
PH High Range
Ammonia
Nitrite
and anything else they want to test
I belive the low range tests tops out at 8.6 so I want to make sure that your PH is not acutally even higher than that.
You should find a product at your
LFS called PH Down 7.0. I have never used this product but from what I hear its supposed to help lower your PH to a specific level. I am thinking that one of the causes of death is the change in PH from the tank water to the water being added.
The nitrite level should not exist but I can see that with your old method of cleaning the tank you probably delayed the production of good bactera in your tank because you was doing almost to good of a job in cleaning the tank.
It sounds like your filter is a hang on the back type with filter cartrages filled with carbon. If so then it might also have an overflow indicator. If you still have the documentation for the filter take a look at it. It might say something like "if you see water flowing over a given area then its time to change the filter media".
TRy not changing the filter cartrage every time but change it maybe every other time. ALso when cleaning the gravel only do about 1/2 of the tank at a time. What your trying to do is to keep some bactera in the tank. All bactera is not bad. In fact there is many benifical bactera that you want to maintain in your tank. This benifical bactera is what helps rid your tank of ammonia and nitrite.
Like Logan I feel you may be overfeeding also. Cut back to 1 feeding per day and make sure they eat all the food at that given feeding. If there is food falling and settling on the bottom of the tank or still floating on the top of the water after 5 min then you feed to much. If its floating try to remove it.
If you dont have a themomoter then you should get one. Its important to know the temp of the water in the tank. THis way when you do a water change you can try to as closely as possible match the temp with the new water as the water in your tank.
Get yourself a few 'fish only' buckets and anything else you use in the tank should be designated 'fish only'. I have some fish only towels, buckets, cups and pitcher. These items never are used for anything other than the fish. And they are never washed with soap. In stead they are rinsed out with declorinated water for the towels they are run thru the washer with out soap.
I like to have 2 buckets. 1 for dirty water and 1 for clean.
Fill your clean water bucket up and put a themoter in it. CHeck the temp aganst the temp of the tank. If its more than a few degrees off then put a small heater in the bucket to bring it up to temp. The temp in the tank should be around 75-78F.
Add your Amquel to this bucket and let it sit for at least 20min prior to adding it to the tank. Check your PH between the tank water and your new water. If the ph is off try to lower the PH of your new water to get it close.
PH is measured in a factor of 10. So a PH of 7.0 is different from a PH of 8.0 by a factor of 10. The amount of disolved oxygen in the water can affect PH to some degree so maybe you should add a bubble wand to your main tank. Or maybe add a Powerhead to make small ripples on the surface of the water. Oxygen poor water will have a lower PH than oxygen rich water.
Once you have the PH and the temp of the replacment water close to the main tank then you can syphon out 5
gal of tank water. Remember to only syphon 1/2 of your gravel bed for any given water change.
when your adding new water dont pour it in quickly. Instead slowly add the water either via a hose or by using a pitcher or large cup. I know this will increase the time to do the water change but it will help your fish out by not being tossed about or having the water change instantly in temperature.
Imagen waking into a walkin freezer and feeling the rush of cold air on your body. Thtas rather stressful. Thats what the fish are experencing if the water change water is colder than the water they are living in.
Good luck.
The cloudy water could be an algae bloom or it could be a bactera bloom. Either way they are not detrimental to your tank other than its appearance. I would suggest trying to get 1 thing worked out at a time vs trying to tackle several complex issues at once.