Based on the information provided, it seems like you are taking good care of your aquarium and monitoring the water parameters regularly. Here are some insights and recommendations regarding the issues you described:
1. Cracky Skin on Fish:
- The cracky skin on your buddy's head can be indicative of a few possibilities:
- Possible Causes: It could be due to external injuries, such as scraping against tank decorations, rough surfaces, or aggression from tank mates. It could also be related to nutritional deficiencies or stress.
- Recommendations:
- Observe the affected fish closely for any signs of aggression from tank mates.
- Ensure a well-balanced diet for your fish and consider offering varied food options to meet their nutritional needs.
- Keep the water quality optimal, as you are already doing, as poor water conditions can stress fish and lead to skin issues.
2. Water Quality:
- Your water parameters seem relatively good, but there are a few considerations:
- pH: Adjusting pH can be tricky and sudden pH fluctuations can stress fish. Monitor the pH closely and make gradual adjustments if needed.
- Nitrate Level: Nitrates at 40ppm are on the higher side. Consider increasing the frequency or volume of water changes to reduce nitrates.
- Ammonia: Ensure that the ammonia levels remain low by maintaining efficient filtration and proper waste removal.
3. Potassium Supplement and Easy Green:
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- It's great that you are providing supplements for your plants. Ensure that the dosages are appropriate as excess nutrients can lead to imbalances in the aquarium ecosystem.
4. Fish Feeding:
- Observing the feeding behavior of your catfish is a good step. Offering a variety of foods, like frozen bloodworms, is beneficial to ensure a balanced diet.
5. Observation:
- Continue to closely monitor the affected fish for any changes in behavior, appetite, or skin condition.
- Keep an eye on interactions between tank mates, especially if aggression is suspected.
If the issue persists or worsens, it may be beneficial to consult with a local aquarium expert or a veterinarian specializing in aquatic animals for a more in-depth assessment and targeted treatment plan.