Why No Prob With Bare Concrete Tank In Backyard Options

[max]

goldfish keeping has become pretty complicated these days , remember cousin of mine used to have a concrete tank 8x3x2.5 cemeted to the floor in his backyard way back in Lorong Ah Soo kumpung days.

There isn't any need for filtration, it is just like throwing the fish in & it will survive. Left in the open you have green water, so green that you can't see the occupants at all not until it surface for food . I remember they is no Hikari or Tetra food, just humble white fish bread, only 0.30 cent. a package & the goldfish wahsay man puipui sweeswee one.

Water change is about once in every 2 months, no drainage system just the tradition way of removing all the fishes, scoop out the water & re-introduce the fish & bingo! .

Can anyone explain why such a method of fish keeping is possible those days & why can't it be the same today?

[mountain]

HB, are you refer to the hairy type of algea?? those that is long enuff to actually swing from left to right to left if there is water current?

can anyone tell me if these are different from patches of green algea on glass wall?? from my observation, my goldfish never nipped on green algea patch.. .. in fact .. they seems uncomfortable with it (if its filtered water)...

i dun have facts to support my claims.. damn .. shall do so when i have more time aprt from work.