johnzhe Posted October 10, 2021 Share Posted October 10, 2021 Context: My tap water is 17° GH and 8° KH. I had a 25g aquarium sitting for about 10 months with live plants (rotala, anubias, ludwigia, elodea, moss etc.) and some snails. In the recent months I did very few water changes. Before getting the liquid API GH/KH test, I had test strips which showed values at the top of the range (180ppm GH/240ppm KH) which was close my tap, so I thought things were normal. Other values were fine. Ammonia zero, nitrite zero, and nitrate close to zero. I was barely putting any food into the tank. 8.2 pH. Got 5 Oto cats two weeks ago, drip acclimated them. Frequent testing with the API Master test kit, everything that I could test for was still fine (zeros for ammonia, nitrite, nitrate, 8.2 for pH). I didn't do big or frequent water changes - only about 10 percent weekly. Otos are eating blanched zucchini hanging from a skewer. Fast forward to today. Got the test kit. 35-40° GH and 30° KH (I got lazy with shaking the test tube at every single drop for the GH test). I'm somewhat surprised my Otos didn't get shocked when I put them in my tank, or that they aren't dead yet. Going to do daily 10% water changes to bring down the hardness without shocking them too much with a parameter change. Scape: Sand-capped organic soil (Green Diamond blasting sand on Root Farm organic hydroponic potting soil). Hardscape is aspen poplar driftwood. I've added some aspen and oak leaves. No rocks. Filter is a USB Nano air-powered Mattenfilter with a pre-filter sponge. Any theories on how the hardness is so high? I'm fairly sure there's nothing leaching minerals in my tank apart from maybe the shells of dead snails. I also wasn't doing just top-offs during the ten months, although maybe evaporation could have concentrated the water. Link to comment Share on other sites More sharing options...
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!Register a new account
Already have an account? Sign in here.Sign In Now