I have 5 tanks all of them have gravel substrate, i have a problem with one of the tank it is the pleco blackghost knife fish chinese algae eater and loaches tank they get along really well never get aggressive,every night when the light go off all of them digging the gravel and put them to the side of the tank leaving left side of the tank no substrate and cloudy everynight. what are they up to? and what sybstrate should i use?
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