URGENT question re: goldfish
i was asked by the grade 6 teacher at my school to help her with the "inherited" tank in her classroom. she is a replacement teacher and doesn't know anything about taking care of fish.
the tank is a 20 gallon tank with one goldfish in it. it has an automated feeder in there and i am not sure if the fish has been getting food lately because it seems that the batteries were dead. i just changed them and he seems to be eating fine and swimming fine.
anyway, here's the problem. . .
i came into the class and did a little mini lesson on how to care for a fish tank and did a water change with the kids on the fish. we did ~50% water change and cleaned the algae off the walls of the tank. i filled the tank back up and treated the water. the fish seemed to be doing ok.
when we plugged the filter back in it didn't work. it is an aquaclear filter (30 i think it said on there?) we had to unplug the filter to move the tank a little to reach the siphon. i honestly don't remember if the filter was moving the water before i moved the tank. :S i brought a filter from home, just a little hob that goes with my 10 gallon. i know it isn't big enough but it is better than nothing until they can get a bigger filter (we live in a super small town, someone has to go out of town to get a filter).
i also bought a plant to go in the tank with the fish. it is pennywort. i hope that it is ok with the fish.
yesterday morning i had 3 gr 6 girls run into my classroom in a rush becuase bubbles was bleeding. i went into the classroom and it does seem like he has a little cut by his fin on his belly. i told them that he probably scraped himself on an ornament in the tank and that is what is causing it. i said it should heal up fine and he should be ok. well, this morning he looks a little worse. he is still eating and swimming just fine but i am worried.
can the pennywort be in some way causing a problem? i am starting to worry now that maybe the pennywort is toxic to goldfish. (i had kinderstart today - next year's kindergarten students come in to get used to school - so i didn't have time to research it this morning) i am going to do more research now but i figured if it was safe for other fish it must be safe for goldfish.
anyway, now i am thinking i am going to treat the tank with salt to help heal the cut. how much do i does a 20 gallon tank with? how long do i leave it in there? how often do i do water changes?
thanks for reading my long and rambling post...