My female Zebra Danio is having health issues. Here are the details:
1. Tank size: 140 L
2. Water parameters and brand of test kit used:
These are the params for the hospital tank.
We use the API Master Testkit.
3. Is your aquarium set up freshwater or brackish water?
4. How long the aquarium has been set up?
The aquarium has been set up for a bit over 1.5 years
5. What fish do you have? How many are in your tank? How big are they? How long have you had them?
4 Danios (one male about 2 months, about 3cm (= 1.2 inches) + tail; and 3 females about 2 months, about 3cm (= 1.2") + tail; 4 corydoras (two females almost 1.5 years and about 3.5 cm (= 1.4") + tail and 2 females about 1 month about 3.5 cm (= 1.4") + tail) and two Oto Cincluses (male and female about 10 months, male is about 2.5 cm (= 1") and female 3.5 cm (= 1.4")) - Those times are how long we've had them.
6. Were the fish placed under quarantine period (minus the first batch from the point wherein the tank is ready to accommodate the inhabitants)?
No. We put new fish straight in the main tank.
7. What temperature is the tank water currently?
24 Celsius (= 73.4 F)
8. Are there live plants in the aquarium?
There are two live plants that have been there over a year and one that was put there about a month ago.
9. What filter are you using? State brand, maintenance routine and power capacity.
We have an Eheim Aquaball 2210 filter. We clean the pads in tank water during water change once a week. 550 L per hour (=145 US Gallons per hour).
10. Any other equipment used (aside from heater and filter which are two very important components of the tank)?
No other equipment
11. Does your aquarium receive natural sunlight at any given part of the day? What is your lighting schedule (assuming you do not rely on sunlight for our viewing pleasure)?
The tank rarely gets natural sunlight, but if we get some sunlight, it's in the morning. Usually we keep the curtain so that the tank doesn't get sunlight. Automated lighting in the tank is on from 11.30am to 9.30pm.
12. When did you perform your last water change and how much water was changed? How often do you change your water? Do you vacuum the substrate?
Last 25% water change was this morning and the one before that two days ago was 25% as well. Another water change the day before that to remove medication was about 40-50%.
Our normal water change is about 30% once a week with a gravel hoover at the same time. The filter is cleaned in the tank water every time.
13. What foods do you provide your fish? What is the feeding schedule?
Our fish get meals at 9am and 9pm. They get flakes, granule foods and dried worm and other bugs mix and we have three different types of pellets for the bottom feeders. Every two days in the morning they get frozen blood worm instead of dry food. We also put a slice of zucchini or cucumber for the otos once a day.
14. What unusual signs have you observed in your fish?
A week ago on Monday I noticed that this female Zebra Danio was looking unwell. She was swimming funnily like shaking her head and looking like she didn't want to use her tail much at all. She had white, thin, stringy poop and she was sitting on the bottom of the tank quite a bit of the time. Her appetite got worse. A few days before I caught her sitting and breathing heavily after her boyfriend had been chasing her a lot so I got a little worried, but didn't know if she was just so out of breath or sick. A moment later she seemed fine again.
I moved her into a hospital tank and put medication in both tanks. About meds lower down.
15. Have you treated your fish ahead of diagnosis? If so, what treatments did you use? State your reasons for planning ahead of proper diagnosis.
Because of having had suspected problems with internal worms before and the presence of stringy poop, I put internal worm medication in both tanks: main and hospital. The medicine was Sera Med Nematol with active ingredient 320 mg emamectin benzoate/100 ml. This medication was for 2 days after which I did a water change. Fish didn't show improvement.
After this treatment I wanted to give her metronidazole with food, but couldn't really get her eating it so I went to bacteria medication in case the worms had caused such a thing. This was JBL Furanol 2 for internal bacteria infections with 20mg Natrium Nifurstyrenat 20mg per tablet per one liter of water. She got a bath in this for 30 minutes (2 tablets for 2 liters of water) as in directions. She seemed a little better later that evening. She was swimming a little more instead of just sitting on the bottom of the tank. The bath was repeated in the same water and medication 2 days later. I kept the water and med in a closed container. After the 2nd bath she seemed very tired and started sitting on the bottom again. 2 days later (today) I gave her one more bath in new water and medication and she's still sitting mostly. She does get up and swim a little when you go to look at her. Her swimming is still shaking from side to side and when she's still, she puts the bottom part of the tail on the bottom of the tank. Swimming seems more effort than it should and turning seems funny. It's like she cannot turn normally, but she has to really twist the body.
All this time her appetite has been worse than normal. She refuses dry food almost completely, but she eats all the frozen blood worm I give her. I've kept the tank without a light to avoid stress. I only put it on while feeding or doing a water change. Her hospital is located right next to the main tank so she can see her friends through the glass. And they have looked at each other.
Could you please advise how I should proceed with treatments as she still doesn't seem recovered enough. I have Jungle's Anti-Parasite Medicated Fish Food with 1% Metronidazole, 0.5% Praziquantel and 0.4% Levamisole in it. Alternatively I can try to continue the same bacteria medication with more baths every two days. Alternatively I have Sera Baktopur Direct with the active ingredient 27.6mg Nifurpirinol per tablet for internal bacteria as well, but I have not used this one. When suggesting medications, please not that I have no access to Kanamycin in Finland. It's illegal here for fish use.
So at the moment she most of the time again sits on the bottom, poops normally, eats only worms, swims funnily and seems a little worse than after the first bath medication.
Any advise would be much appreciated. Thank you!