The Fable of Uncle Johann's Fish...

Uncle Johann was famed throughout the land on account of his incomparably lively and capacious fishpond. People would travel from miles around to take a look at the astounding array of creatures that inhabited it, which ranged in scale (a fish pun, no doubt) from tiny, brightly-colored tropical Centropyge through to vast shoals of boisterous Northern Bluefin Tuna.

Numerous visitors to Johann's pond claimed there was no way that such a broad range of species from different climates and habitats could be made to live harmoniously in a single location; and yet there, before their very eyes, was the incontestable proof that contradicted their claims, if not their clams as well. Others who attempted to replicate the conditions of Johann's pond met only with resounding failure, leading a few poor souls (not to be mistaken for solea solea) to suggest that he was perchance some kind of magician.

However, Johann was no diviner of supernatural fish-powers, merely a man who exhibited incredible mastery over the beasts of the oceans. That is, until he awoke one morning to find his pond covered with a thick scum of algae that was suddenly stifling the bright array of life in the waters below. To various onlookers, the solution to the problem appeared simple enough; one simply needed to clean off the layer of algae that had formed. And yet Uncle Johann merely prodded at it indecisively with a teaspoon for a couple of minutes, and then walked away from the scene.

As the days passed, the situation became ever more desperate for those creatures battling to survive in the depths. A few bass, groupers, and anthias gave up the ghost entirely, causing an unspeakable stench to begin rising from the pond. Now visitors needed to cover their mouths merely to be able to approach this place which had so recently been a site of outstanding natural beauty. Uncle Johann strolled past, looking at the algae and the dying fish, and it occurred to him that he might need to take more drastic action.

And so Johann hired a small army of mechanical excavators, fitted with quick couplers and tilting buckets, to help restore order in his pond. Yet rather than ask those controlling the excavators to skim off the surface scum, he ordered them instead to scoop out the contents from several large sections of the pond. Within a few hours, the algae had been removed; but so had many of the more interesting fish, the ones that visitors had come from far and wide to see. Those fish were now heaped in a pile amid the scooped-out algae in Johann's garden.

A concerned oceanographer walked over to Uncle Johann, and asked him whether he intended to start separating out the rare fish from the unsightly pile and returning them carefully to the pond. "Ach nein," responded Johann, "in a week, we'll just scoop up whatever remains of the fish and the algae and drop it all straight back into the water!"
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mmmm... tuna.

Maybe now more sunlight can penetrate the water, making it warmer.

Toast new regime! :beerchug2:
 
Any farmer know algae needs sunlight to grow.
Here in Kansas, we put straw on the water to stop the light, and this slows the growth. Also Copper Sulphate stops algae and most plant life if used.
 

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