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from http/fins.actwin.com/mirror/begin-chem.html#referenceGeneral Hardness
0 - 4 dH, 0 - 70 ppm : very soft
4 - 8 dH, 70 - 140 ppm : soft
8 - 12 dH, 140 - 210 ppm : medium hard
12 - 18 dH, 210 - 320 ppm : fairly hard
18 - 30 dH, 320 - 530 ppm : hard
higher : liquid rock (Lake Malawi and Los Angeles, CA)
from http/www.hach.com/hardnessguide
The term hardness comes from an expression of how difficult or "hard" it is to wash clothes with the water. When soap is mixed with hard water, these minerals combine with the soap and form a precipitate, or a solid. This decreases the cleaning efficiency of the soap and forms soap scum. As more soap is added, solids continue to form until the minerals are depleted. When the minerals are no longer available, the soap forms a lather and works as a cleaning agent.
Ch4rlie said:Sounds cool, though hate to say it, your tank is not quite long enough for Ghost / Glass Catfish, needs 3 foot tank
Also they do prefer softer water and have range of 4.0 - 7.0 pH.
And they are not really suitable for new aquariums afaik.
Glass Catfish
Vethian said:Im not sure about live bearers either. I fear a bunny boom.
Akasha72 said:would congo tetra's be good for a child? I was once told they have teeth and can bite quite viciously. Maybe something you want to research Vethian before considering them.
Baccus said:Ok, so a Whiptail or two could be the equivelent of a Dragon(s). Or be daring and go for something like Desert Gobies (not sure if they are available overseas, but if they are they are a great fish).
A breed of Corydoras could be the equivelent of the peasant population, hard at work toiling in the "soil".
Congo Tetras could be knights in shining armour (the longer middle part of their tail reminds me vaguely of a knights feathers on his armoured helmet).
Or Emperor Tetras could be the knights or nobility in the tank.
Then because medievil/ fanatasy kingdom had some form of religion/ believe sysyem, Pacific blue eyes could occupy the niche of Angel/ Fairy/ celestial body.
I'm not really sure how well these suggestions will go with your water, but it gives you a bit of an idea of how some fish species could be added to "equate" to something else.