You don't need special swim trucks for saltwater because most are all ready designed to handle different types of water whether its salt water or chlorine water.
Saltwater additives for aquariums are available altmost pet supply stores. You CAN make it at home, with a simple formula for Normal saline, but you need to know your water quality [you may need filtered or distilled water ] , must use special satl, boil and prepare thouroughly , and eliminate particulates . And then you must let it stand to out gas, then strain it , and make sure it becomes to the proper temperature. Then what will you feed it. A starfish is really not a suitable home pet unless you are willing to do all this.
سطل أو دلو . Satl or Dalou.
iron in nails aluminium in coke cans lithium in watch batteries gold in microprocessors copper in coinage zinc in galvanised steel oxygen in air nitrogen also in air hydrogen in water neon in signs uranium in power production sulphur in matches and food preservation chromium in brightwork on cars phopherous also in matches
1. open the choloclate 2. shove your hand in the bowl of choloate and mix 3. add 7 cups o satl and 30 pouds of butter( you know, make it healthy) 4. next eat half of it and struggle to shove the rest of it in the oven 5. when it finaly bakes after five hours of wasting your life 6. eat it like the fat peron you are yea that's right, EAT IT ALL