I had a fixed blade in 01, it rusted initially during sharpening on water stones, but soon after that it developed a slight patina and was rust free since. Gifted it to a coworker and he says it hasn't rusted at all.
My 3 work knives for kitchen, are all carbon. I must wipe after every use, but at times will find little rust spots in the morning, but it rubs away easy with an eraser.
As for storing, i have this camellia oil, but rarely use it. I guess it's because in Ca we have little moisture. Especially since this drought.
And aquariums are very interesting and rewarding. Got one myself.