Oh no, I'm so sorry! Don't beat yourself up though, we've all made mistakes. I lost 4 guppies and 2 bettas to Ich because I never cleaned the tank with soap and switched out the gravel after the first fish in the tank got Ich and died. I didn't even know it was Ich until the 6th fish died. But I didn't give up, and now I own 3 bettas, and it would be 4 but I gave one betta to my brother. They are all very healthy and happy. Don't give up!
Sherlock Holmes - Male VT Lance Sweets - Male HM
Mirage - Male DBT Rocky - Male HMPK red copper
Daisy - Female HM Moonlight - Male HMDBT
Captain - baby betta
Gryffindor - very sick rescue HMDBTPK