This is a common problem. Either they find the food unappetizing, or they are stressed out. Try a quality flake food, such as New Life Spectrum Finicky fish formula, or garlic marine formula. You can find them online for a good price at www.bigalsonline.com
Tuna are all marine (saltwater) and they are predatory, so yes, tuna eat saltwater fish. They can only eat saltwater fishe because they do not live in freshwater.
There are all sorts of different fish in the oceans and seas, and there are many different diets associated with them. There is no one food that ALL saltwater fish will eat.
yes
no
dont you mean saltwater fish?
Saltwater I believe. You may want to double check though :)
yes. please provide tips on fresh water aquarium fish too.
Some species do and some don't
both i think
Yes they do. Striped Bass and other Saltwater species love Bloodworms. Some people say that Nightcrawlers or even earthworms are something that Saltwater fish eat. I have never tried that though. I know those worms work great for Freshwater fish. A lot of Saltwater species like Blood and Sandworms a lot.
no saltwtr fish eat saltwtr food tropical fish eat tropical food fresh watr fish eat fresh watr food
because saltwater fish must be live in saltwater