Shell Grit Calcium Supplement Ph Stabilizing Substrate

A reliable Calcium boosting pH stabilizing substrate for improved health of your mini-critters. No hidden clay, salts, or contamination unlike other similar products. ~400gram bags.

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Shell Grit Calcium Supplement pH Stabilizing Substrate

This stuff is great and I am sure most folks know of shellgrit’s use in poultry feed for improved shell formation.
Without a good Calcium supply the shells of chicken eggs for example can end up pitted, thin, or deformed with uneven coverage.
Same deal with aquatic crustaceans.

Now I better say first of all it is NOT needed or in any way necessary to have reasonable success growing any of my species.
It really does improve the overall health and the productivity though..

Healthy, live home grown Daphnia, means healthier fish that eat them too.

Now you can use any cheaply available calcium source and you should get similar results.
Here is the thing though, not all “shellgrit” is the same.
Some of the problems I have run into using other suppliers and about ~10 different brands are listed below.

Clay content.
While clay itself isn’t necessarily bad, it makes mud when added to water, which means you can’t see anything at all once you add it to the tank.
This makes feeding and harvesting much harder, and it also clogs any equipment you may be using.
Unlike soil, sand, and gravel, clay does not flocculate easily as it is very fine and light, meaning it never really sinks to the bottom and clears.
It just stays muddy looking forever.
As long as you are OK with that, and are able to manage you feeding and harvesting protocols effectively, despite not being able to see in the water, it can be worked around pretty easily.

Salt content.
Most shellgrit comes from saltwater shellfish that have been eroded and crushed by the breaking of waves over a very very long time. It is then mined, sieved into various grades and either washed and bagged for sale, or bagged as is. None of my species are saltwater species so adding salt to the water, even in small amounts can be fatal to them.

Contamination from other species.
If you are sourcing shellgrit from any other source I strongly suggest you do hatch testing, heat treatment, and/or sterilization before using it.
I have had parasitic mites, and filamentous or string algae blooms from some suppliers, even after never having problems at all until one particular batch or bag.
With its normal use as a chicken feed supplement this issue is never encountered, and I am not saying its a dodgy product when used on poultry.

I am saying that culture of freshwater aquatic organisms is a delicate and uniquely specific process, and for me personally, I can not afford to contaminate any of my cultures by using inferior or inconsistent products.
It costs me money and more importantly it wastes my time.

This stuff is reliable, it has no hidden clay, no hidden salts, and for me here it causes no dramas at all.
It’s great stuff and I highly recommend it!


Dump the pack in a bucket of rainwater, rinse very well, removing all the fine particles by slowly pouring off the water leaving the gravelly stuff behind.
Refill and repeat a couple times really mixing it up until the water is you are pouring off is clear.
Failure to do this will not hurt your mini-creatures at all, but it will make your culture water temporarily cloudy and murky, making feeding levels much harder to gauge.
It will also decrease algae levels as algae needs light to grow.

I use one 400gram bag for every 10lt-55lt(2.5gal-14.5gal)- culture tank, and for me that is perfect.
It improves the health of my mini-critters by adding Calcium, and it also decreases pH swings and fluctuations.
These healthy mini-critters then pass their Calcium up the food chain to your fish, so if you are breeding them as a food source then it’s a real must I reckon.