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The easiest way to make the brackish requirements is mix the water for saltwater (s.g. 1.025) in a seperate container,then add 2/3 freshwater. (1 gallon saltwater mix to 2/3 freshwater) in 30 gallons you would have 10 gallons salt water and 20 gallons freshwater.
I would not keep them in a 20 gallon,it's way too small,and they will turn on each other,and the more dominat will kill the rest.They are very territorial. They are also very social if given enough space. You need a wider than deep aquarium,with about a foot of water.They don't require much swimming space,but require more room for movement on land. They have very big appetites,and constantly scavenge for food. worms,grubs,crickets and other small fish/shrimp is a good mix.
PH 8.3 is good
ammonia 00
nitrites 00
nitrates lower the better
muddy water,muddy land
good land is essential; a good mix of stones,driftwood,muddy clay sand/peat,moss is ideal. Not a lot of light,the heat will dry them out fast,but they need humid climates. A small lamp for heat,with a small fan will give them a good mix. Don't think of them so much as fish,but as amphibians like frogs. They spend a lot more time out of water than in it,so youll have more of a terrarium set up than an aquarium. Mixing them in an aquarium,with other fish isn't a good idea,but it has been done. They tend to eat all fish they can catch,as well as frogs,invertibrates,etc. A species specific theme would be better.
View my profile and get a good idea,I have 3. 1 is 6in and 2 are 9in. I will post pics as soon as I can get my issues solved.
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