What can you use to clean a fish tank out with hard water stains?

fish that are routinely and successfully kept in hard water community tanks.
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Hi, the ph level of our well water is high and we do have a water softener but it’s still hard. You recommend a RO system but that might reduce our water pressure. I want to put my Betta fish in a 10 gallon tank. He’s in a 3 gallon right now. I’m thinking the only water I could use is spring water but they are all different as well. What brand name do you recommend to use? Labrador has a demineralized product. Does a Betta need some minerals in their water? I’m so confused and I need help choosing the right water for my little Betta Simon. Thank you
Maintaining the appropriate hard water level in your tank is essential, because it can contribute a big deal in the survival of your pet fish.
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Remove the fish from the tank if you feel you can not remove the hard calcium deposits safely or completely without contaminating the water in the tank. Place them in a properly prepared spare aquarium while you clean the tank. Scrape away large areas of hard-water stains with your aquarium razor scraper. You do not need to remove your fish while scraping the tank.
Photo provided by FlickrHow to Remove Hard Water Stains From Fish Tank
Photo provided by FlickrAngelfish in Hard Water? - The Planted Tank Forum
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Another problem is that carbonate saltsquickly latch onto any dissolve carbon dioxide in an aquarium, makingit unavailable to any plants in the tank. In soft water aquaria, thesmall amount of carbon dioxide released by the fish is often enough tokeep the aquarium plants happy, but in a hard water aquarium, thiscarbon dioxide is quickly neutralised by the carbonate salts. Carbondioxide fertilisation therefore becomes much more important to makegood the losses, and aquarists that don't fertilise this way oftenfind that their plants only grow indifferently, if at all. The cichlids have to be close to the top ofany list of hard water fish. While many are adapted to soft, acidicwater conditions (not least of all the ever-popular angels, rams, anddiscus), by far the majority prefer hard, alkaline water. All thecichlids from the Rift Valley lakes -- Lakes Malawi, Tanganyika, andVictoria -- fall into this category, as do many of the species fromCentral America and from Asia. Now, having said this, not all of thesecichlids make good community fish. So while keeping a Rift Valleycichlid aquarium is certainly one option for the aquarist in a hardwater area, the focus of this article is on those species that will dowell in a community setting. On the other hand, a tank set upspecifically for these fish can be extremely rewarding. These fishrange from tiny, shell-dwelling forms rather like gobies through togiant predators and schooling plankton-eaters. Any aquarist living in ahard water area should certainly consider keeping these 'freshwatercoral reef fish' -- in terms of colour, activity, and variety, RiftValley cichlids are hard to beat. Livebearers that are more unusual are theGoodeids. Whereas poeciliids are ovoviviparous, Goodeids are trulyviviparous. What's the difference? Ovoviviparous fish merely retaintheir eggs inside the body, whereas viviparous fish actually supply theeggs with food via an umbilical cord. Though certainly not asfrequently seen as guppies or mollies, at least two species, and , can be obtained easily enoughfrom the larger aquarium stores. , the butterflyGoodeid, is a peaceful and hardy fish that is often said to be theideal Goodeid for the beginner because it slots into a community tankvery well. As its common name suggests this is a pretty fish, with aspeckled, silvery body and, on the male, a black tail edged withyellow. is also a pretty fish and one that doeswell in hard water, but wild specimens in particular can be persistentfin-nippers. Tankmates should be chosen with care, and be sure andchoose species that do not have long, trailing fins. African riverine cichlids are usually mucheasier to keep in community tanks. One popular choice is the Kribensis,. Kribs are very attractive fish, the bestexamples sporting a mix of cream, purple, and brown. While they arejust diligent as about broodcare as other cichlids, they tend to holdquite small territories and often the only sign that the fish havespawned at all is when the aquarist finds the parents leading theiroffspring out on a hunt for food. Note, however, that hard waterisn't ideal for breeding Kribs because a pH above neutral tends toresult in a preponderance of male fry.