I have had 12 smaller fish (not betas) which unfortunately all died because of a disease I'm not able to 'diagnose'. But, I thoughtlessly used their net on one of my favorite betas and because of this he died two days ago.
I've washed out his 5 gallon tank with hot water, including his plastic plants and bridge. Now, my question is - can I use his old tank, decor and plants for one of my other betas? I believe he had either ich or velvet so I'm not sure if it'll spread to my other healthy beta. Is it worth cleaning out again? And if so, should I use bleach or something? I've heard from many not to use cleaning products but I really can't stand to lose another one of my babies.