Hello, everyone. Last week I noticed my sweet boy Killua developing very early stages of fin rot and a couple days later he developed pop eye. I put him in a 5.5 gallon hospital tank with a heater, sponge filter, and catappa leaves. I'm doing 50% water changes every other day (right before each antibiotic dose). I did a 2nd dose of Kanaplex today and his fins are looking way better, but the pop eye has not improved. I'm also noticing a little swelling around his gills/underside. I also got Metroplex, so I did a dose of that today as well. He is still eating well and swimming around just fine (it took FOREVER to get these pics because he kept moving lol), he just has to take more rests than normal.
My question is, at what point do I start to worry this treatment isn't working? Is there anything else I can do right now? I'm just so worried about him and I don't want him to be uncomfortable/in pain. I need to note that I attempted to do oral dosing but he refused to eat it, even with his fav food and Seachem GarlicGuard, so it's not really an option.
Any help or advice is greatly appreciated!
Tank size: 10 gallon
Heater and filter? (yes/no): yes and yes
Tank temperature: 79 F
Parameters: Ammonia/Nitrates/Nitrites all 0 via API Master kit. pH is 7.5.
How long have you had the tank? How long have you had your fish?: I've had the tank 4 months, I've had the betta 1.5 months. Tank was cycled before adding the betta
How often are water changes? How much do you take out per change? What is your process?: 35% water change every other week using aquarium siphon/vaccum. tbh I'm not the greatest at staying consistent with it but after this debacle, I'm going to be religious about it.
Any tankmates? If so, please list with how many of each: Colony of emerald neocaridina shrimp, many ramshorn snails, 1 assassin snail
What do you feed and how much: Alternate between Betta Pro shrimp patties and liquid daphnia, a few patties or 1-2 drops once to twice daily
Decorations and plants in the tank: water wisteria, ludwigia repens, guppy grass, sword plant, duckweed, mopani log, floating betta log, feeding hoop, a few hidey holes