I am fairly new to aquaponics and this my second summer trying it. Question is, there seems to be a slimy black film covering my clay pebbles. Is it fish poop, algae or mold? Don't know if it's toxic and I should be washing and starting all over? It is in a greenhouse, and it's just a small system (flood and drain) supported by about 8 goldfish in an a 21 gallon tank below.
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