Originally Posted by Lupin
What you need
400 grams of plaster of Paris (Dap is often recommended but I used Bronco)
50-100 grams of fish food (pellets or granules are best)
Stick to stir
Ice cube trays
Pour the plaster of Paris over the clean water. Stir as you pour until the plaster of Paris look like thick paste. Then try to mix in the fishfood as you stir and pour the mix to the ice cube trays. Make sure to smoothen the plaster of Paris as you pour. Place them in a warm dry place for a few hours. You can place the fan on it if you feel it necessary. Afterwards, twist the ice cube trays to remove the calcium blocks.
The more humid the environment, the longer it takes to dry the plaster of Paris. It should harden as a rock and sink. Be careful not to allow any thick bubbles as you work on it. If the calcium blocks have gooey stuff at the center, then it is not dry enough. It should also not break apart.
I was out running around today, and I decided to pick up the ingredients for this. I was excited to come home and make it (I don't even make anything this complicated for myself - if you can't microwave it or just eat it, then I don't do it). My last stop was the Petco down the street from my place, on the way back home. This is when I realized that I didn't buy any ice trays!
Now that it's midnight, I just remembered that there was a tiny one in my tiny fridge when I moved here. I found it, but I think I'll wait until tomorrow to try it, and maybe get a regular-sized ice tray.
By the way, it was difficult to find pellets or granules at the small Petco I visited, so I looked in the reptile section and found Jurassi Diet Hermit Crab Food which has Calcium Pantothenate, but doesn't have calcium listed under guaranteed analysis. However, it does have Vitamin D and states that it "contains no soy, which can impair calcium absorption.
Anyway, I'll let you know how things go...
I forgot to ask. I've noticed that some things, such as the hermit crab food and shrimp pellets, contain copper sulfate. Will this be harmful to the snails, like copper medication?