Might be worth to move the fish to a temporary holding tank and start that tank over. Use some kind of quick cycling liquid like Seachem Stability or API Quickstart or something to restart your tank when everything's cleaned out really well. Make sure you remove those tiles too. Most cichlids are pretty hardy but you may have some casualties. Is your drip system have some kind of pretreatment for chlorine and other chemicals? If not it may have been slowly killing off your beneficial bacteria, thus leading to this breakdown.
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drip system was only running for a day and a half but i think you are right, with the water change and drip, aswell as the slightly cloudy water ive been having issues with for the last 3 weeks the balance has just tipped...