Hello Jenwer333 Very worrying you have 3 different symptoms but yet seem to have a good clean regime, but we must dig deeper as almost certain this is bacterial and also possibly fungus type symptoms caused by poor housekeeping,you never posted water parameters you can never assume they are fine you must check frequently for peace of mind especially ammonia, difficult to say but your water and tank looks dull cloudy and algae , please get water test kit and repost* Immediate actions are aquarium salt baths look back previous posts for how to! Step up water changes slightly ensure you are using a water treatment such as PRIME , do you hoover the tank bottom? How often do you break down filter and rinse in dirty tank water* renewing substrate other than carbon is a last resort a filtrate sponge should be falling apart before it requires replacing providing you rinse it regular* am fairly sure you should be giving an anti bacterial treatment such as marcylan but I will step back here as I have zero knowledge of treatment other than aquarium salt which will help both bacterial and fungal symptoms but you may require something stronger* If in doubt seek vetenary advice





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