hi, im a new fresh water fish tank owner. recently i introduced 3 fish to my tank. about 4 days ago i started noticing that my fish were getting stressed and one already died. i have three fan tails, 2 betas and a neon fish. i have had a fantail that died and a black moor that also died. my other remainder fish have white specks on them and ther is one fan tail that has red marks on it. please if anybody knows what i have to do cure them let me know. thanks