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]

My fish actually love them judging from the hugh amount of green poos at the tank bed   

your fish gets huge amount of green poos just from muching on those mats of green algeas? !! hmm ...

anyway.. if u refer to my other posting in the Poo thread, my indoor green poos are intense green .. unlike those i saw in Competition is vegetable green .. i don't know which is good though .. maybe others who own outdoor green water tubs can share their poo ..