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Update... Ended up using water softener pillows to lower the hardness. GH and KH now 5-6. However, the ph is still high at 8.2, tested on a high range kit and mid range kit as a back-up. The remaining angel has red streaks in it's face between the mouth and eyes and red lines at the base of...

Almost certainly a foreign substance has entered the water. When the chemistry and temp check out, nothing else will kill fish faster.

Between both tanks: glow tetras, neon tetras, angelfish, cory cats, red-tail shark

Good question. I've been using two pillows in the 55 for a year or two now and the effect has been able to keep the PH value just below 8.0. Otherwise it hits 8.3-8.4. I will test GH/KH of the 55 soon and share the results here.

The 55 gallon glass hexagon has a HOB Marineland Penguin power filter and an air stone for added circulation due to the depth. The smaller tank is a 29 gallon acrylic Uniquarium. The 55 has been running for decades, the Uni is about 2 years old. Granted, this is the first time I've experienced...

What causes the PH value of the water in an aquarium to increase over time? For example, I have two aquariums, one newer, one older. Each has aquarium gravel, one colored, one natural. Each has plastic plants and each has different decor such as formed resin or other types of decor rock like...

I would have your water tested elsewhere by a trusted source. I have seen a color reading variations in test kits many times over the years. See how your reading compares to the reading of another test source.

Greetings! I have a long term freshwater aquarium (set up and taken down a few times over the years). It is a 30 gallon hex glass tank with a power filter and an air wand for added circulation. It currently has 6 mid swimmers (assorted Tetras) which seem to be doing well. I am having a tough...