fish hiding

Why Is My Fish Hiding Behind The Filter? 11 Possible Reasons

So your fish has suddenly started hiding behind the filter, and here you are with no clue whatsoever. A fish may hide behind the filter when it’s threatened, stressed, or feeling uncomfortable. Many reasons that can cause uneasiness in fish include environmental changes, bullying, threats, sickness, injury, pregnancy, loneliness, overpopulation, exposure to intense light or…