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Don't get put off, and don't let the shops just sell you lots of fish, never buy more two at any time and that's dependant upon their sizes. Back in the day I had 8 tanks 2 x marine ( one dangerous fish like lion fish, a shark, snowflake moray, porcupine puffer etc and the other one tranquil ) 2...

If you introduced them all at once, that may be why. You need to introduce fish gradually the the water levels can adjust. The nitrate levels may have been too high, in other words, too much fish piss and pooh