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I have a 10 gallon community tank, with one betta, six neon tetras, and two albino Cory catfish. I’ve had this tank for a little over a year, and do 25% water changes once a week. All the fish get along very well, and up until two months ago, have been very healthy. About two months ago, I...

Fish food catastrophe.  While I was away my friend dropped a whole container of fish food into our 20 gallon community tank, killing one of my two african dwarf frogs and 2 fish.  I have been trying to get the tank back to healthy (I was away for a month and a half and nothing beyond scooping...