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post #1 of 2 Old 05-14-2008, 07:39 PM Thread Starter
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Alkalinity of tank

I have a 55 gal tank. It has been set up for 5 months. I have 5 sponge filters and a power filter. !2 plants have been growing in the tank for about 1 month. I also have a large piece of driftwood that was leaching tannin into the water. To clear the water I have been using charcoal.I have 6 angel fish about the size of silver dollars or slightly larger, and 4 platties, with 1 cory to clean the leftovers up. Water temp is at 78 deg. Tested the water yesterday, ammonia 0, nitrite 0, nitrate 10, hardness 200, ph 6.9, and my alkalinity was at 20. The alkalinity has dropped from 100 the week before. I have no idea why. I understand this is a buffer for ph, but am not sure if I need to do anything
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post #2 of 2 Old 05-14-2008, 09:21 PM
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Okay, first question is are you using test strips or a liquid test kit? If it is test strips this could be the reason for the change. They can be accurate but in my experience they aren't accurate very often.

20ppm is kinda low, usually I shoot for 3dKH or about 60, if not a lot higher.

The best way to know if you need to even worry is to find out exactly what your alkalinity is and then see what the fish need. KH or alkalinity for buffering pH is more important for CO2 injected tank but also important depending on what your readings are from your tap water.

Test your tap water after it has set out overnight preferably with an airstone bubbling in it. This will help others to give better information for your specific needs.

Of course this all assumes I have not totally mixed up my terms and Kh and alkalinity have nothing to do with each other.
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