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.

[HappyBuddha]

Finally I want to add a note about the water discharge pipe -- get large diameter ones if you can. It takes a long while to discharge 375 litres of water (about 20-25 minutes for my 200 litres tank using a typical household gardening hose!)

A larger diameter piping will cut down the waiting time noticably especially if it has to travel a long distance.