@lisag, I am so upset to hear that tragedy of you accidently sucking up your fish under a vacuum tube cleaner, well you didn't mean it and it was unexpected, yes it's dangerous and sounds like we need to be extra carefully and alert about it,
and @Swishee is right you must nudge it away if it came near your suction tube. (wow, what an expert on the tip!!)
Ohhh, I need to get myself one soon the vaccum pump cleaner tube (I am not good with precise name I use my own way of saying it haha), and I am a beginner in all this.
LOL having fishes are fun especially when I put the aquarium beside my bed,
I love lying on the bed and watching my fishes it's so wonderful to see them where I spend most time with my two cats (in my bedroom). The lid on my aquarium is helpful protecting it against the cats paws now they can't stick their paws in it.