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Hi, I just got a new PH probe, placed it in my freshwater tank and had a reading of 14.0. So I filled a cup with tap water and it read 8.6. The probe hasn't been calibrated as I have no buffers. When I place the probe back in the tank it goes to 14.0 quickly which is the maximum the atlas circuit can read. After taking it out and putting it back in the cup of tap water it goes down to 8.6 and always does this. I haven't test the PH for months but when I did have a probe running it was ok.
So it appears I have something wrong with my tank and would like any thoughts on what's causing this and how to correct it.
In the last couple months something strange has been going on with the tank and probably related, there's always a layer of something on the water, sometimes its quite thick. I use a cup to skim it off but the next day when I go to feed the fish its back. Then out of the blue it'll be crystal clear for 2-3 days and the scum comes back.
I have Red Tetras, Dwarf Rainbows, Cory Pandas and Ghost Shrimp, everything seems to be doing good. Fish are always active and eat and no deaths for a long time. The tank is 125g, soil, planted and been running almost 2 years. There's been a lot of growth over time and lots of plants cut out so the soil is full of roots. The tank has 2 large canister filters and I do 30%-40% water change every 7-10 days. I just did an ammonia and nitrite test which both are good. I'm out of nitrate solution so couldn't test it.
So it appears I have something wrong with my tank and would like any thoughts on what's causing this and how to correct it.
In the last couple months something strange has been going on with the tank and probably related, there's always a layer of something on the water, sometimes its quite thick. I use a cup to skim it off but the next day when I go to feed the fish its back. Then out of the blue it'll be crystal clear for 2-3 days and the scum comes back.
I have Red Tetras, Dwarf Rainbows, Cory Pandas and Ghost Shrimp, everything seems to be doing good. Fish are always active and eat and no deaths for a long time. The tank is 125g, soil, planted and been running almost 2 years. There's been a lot of growth over time and lots of plants cut out so the soil is full of roots. The tank has 2 large canister filters and I do 30%-40% water change every 7-10 days. I just did an ammonia and nitrite test which both are good. I'm out of nitrate solution so couldn't test it.