No, i wouldn't use it in the freshwater tank. It's been sitting in salt for quite a while, and chances are your salt water sand is comprised of bits of shells. They will throw off the chemistry of your tank and lead to fish loss.
Well, there are 2 types of fish, saltwater fish, and freshwater fish. Only put in saltwater if you own a saltwater fish. Note: Saltwater fish could live safely in freshwater, but freshwater fish will suffocate in saltwater.
All you need is an aquarium, a filter, a lighting system, sand, live rocks, some saltwater, and something to start the cycle.
Yes, but be prepared for some cloudy water.
Yes ofcourse you can have them in your saltwater aquarium. You have to provide some space in your tank with good sand and feeding sand dollars is easy, for they mostly eat suspended organic matters and other fish wastes.
Nice clean sand that is meant for an aquarium. Be sure not to get saltwater sand for a freshwater aquarium. The reason sand is best is that (1) unlike gravel, it does not have anyplace for uneaten food to hide. Uneaten food is the number one polluter of aquariums, and pollution causes disease. (2) Some fish are sensitive to the rough edges of gravel, and some of them even become damaged by it -- such as certain loaches and catfish, whose barbels get scraped up by it. People keep buying gravel though just because of the cosmetic effect. I'd suggest getting some nice, fine-grained, soft white sand. It makes a great background for any color of aquarium furniture.
Its the rock, sand, gravel, whatever on the bottom of an aquarium.
You mean substrate?
white sand :)
The question should be worded, At what temperature do saltwater live. And the answer is all. there are fish at the Arctic's such as cod. but if your talking about an aquarium which is what i think you meant to say, the answer is 75-80 degrees Fahrenheit.
because the fish want it
and the saltwater ecosysteam.
An aquarium, if you want plants, depending on the type you may need substrate, a filter, sand or gravel about 1 pound per gallon, a light between 5000K and 6500K (it does not have to say aquarium), water purifier, water, fish food, a power strip that has at least 4 outlets, an aquarium heater if you are going to have tropical fish. and about 30 minutes to put everything together and add water