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Thank you for the kind welcome! I have been doing ~10% water changes weekly, with gentle substrate vacuuming once or twice a week. I'm happy to adjust based on your recommendations.

I have been doing a gentle substrate vacuum twice a week, and about 10% water changes weekly, with a 25% change yesterday after our fish died. We've only had them for a few weeks.

Hello CaptainBarnicles, Thank you for the advice. I would normally be right there with you on only treating for the right thing, but was feeling desperate to help the little guys and saw a few things that pointed to some kind of infection (the fin rot I believe I saw on the orange tail guppy...

It looks more like a straight stick with no bristles. I'll reply to the antibiotics under Captain Barnacle's comment.

It was straight and did not appear bristled. pH is 7.8; I don’t currently have a way to test pH 7.8; I don't currently have a way to test for gh and kh but would be happy to obtain that. I'm using the API FW master test kit.

Stressed guppies

And now one of them has something red protruding from its anus! Some kind of worm infestation? Everyone in the tank looks stressed.

We had 7 guppies two days ago; we lost two yesterday and now two more are on the bottom of the tank. One had white stringy poop last night. I dosed the tank last night with the first of 4 days of antibiotics b/c one of the deceased guppies had fin rot. What should I do for the guppies? Tank...

Hello, we are a small family that has started trying to keep fish over the last few months. We currently have 3 Cory catfish of a muted grey (green or bronze, maybe?), five assorted guppies, and one plecostomus of undetermined species. 37 gallon tank, heater (79-80), plant media substrate, live...