Normal rocks are not healthy for gold fish. Although you can use them as long as you clean the rocks before you put them in your fish tank. There are lots of harmful things on rocks that can get your fish really sick, if you have expensive fish your best bet is to use the rocks that you get from your local fish store. I had some of the same type of fish you had and i did not listen to someone telling me the same thing I'm telling you and all of my fish died i would not want the same thing happening to you. I wish you luck on your fish tank
No! marine fish are salt water fish and tropicals are fresh water fish, this cannot be changed.
no
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No, clown fish are marine fish and tetra and guppies are freshwater fish.
small ones
no its not okay
it's not unusual for a fish to play with his rocks.
One can purchase a fish tank heater at various pet supplies shops. PetSmart, Petco, Marine Land, and Argos all have fish tank heaters for sale on their websites.
Blow fish (Puffer Fish) are tropical, brackish or saltwater fish. Usually found in the more salty parts of estuaries. In captivity they are regarded and treated as "Marine Fish". Setting up a marine tank is a very complicated business and involves the use of technical equipment like Protein Skimmers, Ozoneizers and the like. Maybe you should ask your question in the marine section.
normal rule for fish in a tank is: For every 1 inch of fish there is 1 gallon of water
yes. just dont put the rocks ON the gold fish...