I’m not sure what I can do here.

Assume there wasnt any maintenance and also assume it was offered too much food

This lead to high nitrate which is bad in high concentration

Also too much food falling on the bottom the tank will rot and turn into ammonia , then nitrite which are both harmful when present in bigger quantity than the ecosystem can process instantly.. they also end up increasing nitrate since its the end by-product of the nitrogen cycle ..

IF the tank was cycled before those guys been thrown in .. but ill also assume they were used to initiate the cycle which is cruel.

Thanks for taking them , but have you got any cycled tank ? If not .. get reading on Aquarium nitrogen cycle first and foremost before harming them more.

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