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Do fish need calcium in the water?


FishySituation
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I recently discovered that my tap water has very little calcium. I recall information from a YouTube video or something stating that calcium in the water is vital for fish. Is this true? I always assumed that the fish food contained calcium and all the minerals they needed. If this is true then it would explain the slow growth of my Cory cats and other problems that I could never figure out the cause. Same thing for plants. I just started dosing equilibrium to fix this 

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I'm not sure, but your question made me wonder how much much calcium meets their daily nutrient needs? fish species may differ in their need, and what percentage of that do fish absorb from the water? do you remember the source of the water absorption idea? you can check your fish food for how much calcium it contains, but I'd dig deeper for some academic sources to find out what they need before throwing any additives in the tank.

Edited by LadyoftheLake
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8 minutes ago, LadyoftheLake said:

“do you remember the source of the water absorption idea? you can check your fish food for how much calcium it contains...”

I believe the video where I heard this was KGtropical’s video on GH and KH. Also I have checked my fish food ingredients and they all contain very little calcium other than the repashy. The food that the corys eat has calcium listed as the last ingredient so I doubt it is a sufficient amount 

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I mean calcium is definitely important to have in your water, especially if you have plants, but even for your fish too, especially if you're breeding them. But if you dont have enough calcium in the water I'm pretty sure, not 100%, that that could lead to things like hole in the head, now not saying if you dont that it 100% leads to that, and also I'm not even sure the accuracy of that, but I do know that at least a little calcium and other trace elements in the water column are important for fish

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Interesting,

The answer seemed to be 'it depends'. And even more importantly the amount of calcium needs to be carefully balanced against the amount of phosphorus in the diet as calcium can inhibit the uptake of phosphorus (with negative consequences).

'Higher dietary Ca levels reduced weight gain and feed efficiency values in channel catfish (Gatlin & Phillips 1989), rainbow trout (Spinelli et al. 1983) and Chinook salmon, Oncorhynchus tshawytscha (Richardson et al. 1985). Nakamura (1982) and Porn-Ngam et al. (1993) have also reported inhibited P absorption with increasing dietary Ca levels in common carp and rainbow trout, respectively.'
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