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Seale's are always out and about. You should get some more. They shoal real nice. The breeding pressure does reduce their lifespan. Once my Maragrita Cardinal dies I am definitly getting one.
Check out the coralvue controller. You can probablly use this. Control a Heater and powerheads. If power goes out I would be surprised there wasn't a notification.
https://www.bulkreefsupply.com/hydros-control-2-starter-pack-aquarium-controller-system-hydros.html
Use seachem iodide. Do like 5 drops per day and then retest with another ICP test a month later. Then either increase or decrease drops. Question though? What is wrong and what donyou think iodine will do?
I think your gobies took the worms. Just my opinion or they just died. Not an easy animal to keep long term. Your hammer probably is kicking the bucket from something like brown jelly disease. Would be interesting to know what it looked like the few days before it went missing. Fluctuations...