Hi, I bought a new 55 gallon 200 litre tank about 3 months ago. For about 2 months I have had at first 9 malawi cichlids then added another 13 making 22 malawi cichlids, after allowing the aquarium to cycle correctly before adding. Please help!! I have had 7 of my fish die in 2 days and havn't got a clue what it could be? I recently vacuumed the gravel as I have an under gravel filter, at around 30% along with water change of around 25%. The fish tend to be very lethargic some lying on the gravel and some floating near the surface getting air. A couple of days ago a lot of the malawis were quickly brushing themselves against the gravel and rocks? I'm at a total loss, my test results show all ok usual test strip. One other thing if it helps diagnose my problem is the dying tend to have a erratic fit splashing and darting in the tank before quickly rolling over and sinking to the bottom dead. Any advice or help would be greatly appreciated
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