Sorry if this question has been asked before but I'm uncertain about the whole sterilization process but there seems to be conflicting info. I have a 10g tank and that my two betttas shared ( divided) and they recently died of what I strongly think was a parasite or internal fungus infection that didn't respond to many different types of medications and proved fatal. So, I need to disinfect the whole thing, including rock caves, gravel, net, fake plants, filters, syphon and heater. What can I use safely but that will kill the parasites? What is the method used? How long do I let it soak for and how do I sterilize all the equipment and decor too? etc etc Also how do I know that this will have killed off the germs for sure? plus, how do I know the chemicals won't kill the future fish I put in there? I'm almost tempted to ditch the tank and buy a new one at this rate! Thank you so much in advance.