For the 7 days were you having someone feed the tank ? Sounds like it might have been overfed hence the high levels. Keep changing water, and keep skimming and be patient. the biggest thing is get that ammonia down. Try not feeding for a couple of days, or cutting way way back. Also try knocking your lighting times way down. your micro bubbles are coming from within the powerhead as it evacuates small pockets of air slowly
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