Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Look at your water company's annual report.
Also, look at your own plumbing fixtures.
If the water company report says the General Hardness, Alkalinity, Total hardness, Calcium or Magnesium are high, then your water is probably fairly hard.
If you see white crusty stuff around faucets (sink, tub, shower) then your water is probably fairly hard.
Adding calcium carbonate rock (dolomite or any of several other names) to water that is already hard is not a problem.
To research your local regulations about selling plants you might try something like the Department of Agriculture. There may be state regulations, too.
However, if you are buying them locally at stores then I would go ahead and sell them at little things like craft fairs.
There are 2 basic problems with plants, and both are involved not when the plants are moved (sold) within a state, but when the plants move from one state to another, and when plants are imported.
Soils can harbor pests, and the plants themselves can harbor pests and when plants are imported or moved between states they need to be inspected to be sure pests are not also being moved.
With Marimo Balls there is obviously no soil problem.
The other major area of problems when moving plants is that some plants can live outside in wild rivers and lakes, and become quite a pest. Some aquatic plants can grow so well out of their native habitat that they block shipping, clog intake pipes for irrigation and drinking water, and crowd out native species that wild animals depend on for food.
Each state maintains a list of plants that they are concerned about.
Goldfish need a MUCH larger tank than 10 gallons. I kept my 5 goldfish in a 45 gallon tank, but only until they were large enough to go into my pond.
Cleaning the tank only every several months is horrid.
Would you keep a Saint Bernard in an apartment with a small balcony, and only clean the balcony every few months?