5 Ft Tank Options

[sushiman]

Hi all bros,
I would like to set up a 5 ft by 2 ft by 16 inch tank(EOS) to house
4 ranchus(all 5 inches) and 4 oranda with various sizes.The tank is something like
AC's main display tank but wf bottom flow.

My qns is :

1) Is it ok to house 8 GFs?
2) With (EOS),how much of water i need to change b4 n after my tank is mature?Weekly?
Hope u guys can help to advise.Anythings i miss out?Thanks in advance.

[white horse T1]

a. that's abt 376 litres.
going by 100 litre per fish. at most 4 fishes.
if u lower it to 50 litre per fish. at most 7 fishes. this may mean increase in the water change freq.

b. how much to change depend on the bioloads (no of fishes) , build up of beneficial bacteria to breakdown this load and the water quality - ammonia, nitrite and nitrate & PH as well.