Calcium Deposits?

Calcium usually deposits as a white crust on the side of the tank at the water line, but I suppose it could flake off if there's a lot - and with hard water there could be a lot.

If they sink, you'll hoover them up when you do a water change. For those on the surface you could try the method used for oily films. Turn the filter off and when the water stops moving lay a paper towel flat on the surface. Then lift one side slightly and draw the towel across the water surface to the side of the tank before carefully lifting it out of the tank. If that helps, repeat till most of it has been removed.

Then turn the filter back on.



Do you have filter wool/floss in the filter? That should trap any bits that get sucked up.

Since limescale is what was in the water to start with it shouldn't harm the occupants. When the tank water evaporates it leaves behind the stuff that was dissolved in it, and with hard water there is quite a lot of stuff dissolved causing more limescale than those of us with soft water. For example, my kettle never gets furred up with my soft (ish) water.

What do you mean by "a filter for the taps"?

If you mean a water softener, don't. They work by changing the 'hard' minerals for others. The problem with that is that the water ends up with chemistry completely different from anything found in nature and fish just can't cope with it. Even a Brita filter that you attach to the taps does undesirable things for fish.
Or if you mean an RO device, that's fine as long as you mix it with some tapwater or add remineralisation salts as no fish sold in the aquarium trade can live in pure water.

Ahh, that's OK then 

Are the white bits coming out of the tap?

I think I'd contact your water supplier!


If the bits coming from the tap are very fine you won't find much to filter them out I'm afraid. But if they are visible, there might be something you could do.
Maybe line something like a colander with filter wool and either run the water from the tap through it into the bucket, or from the bucket through it into the tank. If you were gentle with the filter wool and let it dry between uses it should last a while.