A brief internet search on human pathogens in fish tank water lead to [url=https://www.freshwater-aquarium-fish.com/articles/human_aquarium_pathogens.htm]this article[/url]:
Looks like there is a chance of salmonella being in the water.
I would HOPE that restricting the water and filter rinse to the compost pile and fruit trees would be ok. An internet search on composting to remove salmonella indicates that a hot pile will destroy the bacteria but it is unclear if the bacteria is killed in a more typical cool pile. 
I should have elaborated earlier when I said I watered my plants with aquarium water - I was referring to the houseplants. Until I find out otherwise I will NOT be using it to water my veggies (and I'm not sure on the compost pile now either)!
Any insight here on eliminating salmonella from compost or landscape water would be appreciated. It would be a shame to restrict this nitrogen rich source to only landscape shrubs!
idea, but I don't think it's always about "killing" the "bad" bacteria. What kills bad bacteria can also kill GOOD bacteria. What we think of as bad -- salmonella, e. coli, anthrax, ... whatever ... are naturally OUT there (oops! a bird pooped in my pile! 
), but a sufficiently diverse compost community would provide competition against or even overcome the offenders so that live compost would still be safer than dead 
Don't get me wrong, hot compost is great if you can achieve it, but for the rest of us 
, I'm just saying we don't have to sweat it as long as we're not overloading the pile with concentrated BAD stuff. (Again, JMO)
