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We just lost a betta to fungus, so I sanitized his tank & equipment but neglected to do that with the 2 nets we use. We have another 37-gal community tank and yesterday found a serpae tetra with a white cottony-looking spot on one side of his head. We put him in the QT tank, then today found 2 red wags with white places beginning on their fins. Have I transferred the fungus to the large tank via the nets? Should I quarantine them too or try to treat the whole tank? So far the other fish look fine.

We have neons, gouramis, white clouds, glofish, & red wags, a shrimp & 2 tiny crabs. Water tested OK, changed 50% day before yesterday. Tank is heavily planted also. Please help with advice, we're at a loss now which way to go, just don't want to loose anymore fish.

Thanks very much for your help.

You can easily transmit saprolegni fungi on nets and by sharing tank equipment, but i have a feeling in the ol' gut that because of the speed of the infection and quick adaptation into different aquaria, that the disease your fish are suffering from isnt actually a fungi, but a bacteria that looks a great deal like fungi,and is far more contagious, namely flexibacter columnaris.

All you need to know should be here.
http://www.fishprofiles.com/files/profiles/d100011.htm

Hope that helps! Good luck.

^^ agree, it is likely to be bacterial. Keep your eyes open for other presentations too, they may not all show up looking like fungus.

For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett