07-24-2011, 12:52 PM
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Those fish all prefer quiet waters with little movement, so a canister would be ideal, and lots of plants. However, you have some real issues in this mix of fish.
The Dojo Loach is temperate water in temperature and should not be put in a tropical temperature tank. More info in the profile, click the shaded name.
Angelfish are sholaing fish and should be in groups, 5-6 would be lovely in a 210g. More info in the profile, click on Pterophyllum scalare. But nocturnal fish like the knifefish would likely stress angelfish.
The Black Ghost Knifefish, Apteronotus albifrons, attains almost 2 feet in length and is stiff bodied, meaning it needs a tank that is at minimum 2-3 feet front to back and 5-6 feet in length. Lots of hiding spots, thick plants, dim light (the fish is nocturnal) and minimal water movement. Smaller fish will be eaten as this is a predator, though a shy one.
The bichir is also predatory, and needs warmer water than the Dojo can manage with.