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Get a reefer to watch it, laymen can do the easy stuff, but if there are issues, you might have a problem.
If you don't have a controller it would be wise to have one. They are tank savers...
My gyre 150 just started to fall apart this week after about 9 months of use. Cleaned regularly. After taking it apart, its really poorly built. Will not buy again.
Thermo couple is probable, but if it's a newer furnace with spark ignition, the igniter could be bad. Look at the pilot area and have someone adjust the tstat to call for heat. See if you get a spark. Regardless you will need a service call. Best of luck.
It's Russian roulette adding a new fish to a healthy population. Its not worth the expense and heart ache. QTing works. When we have sick humans with infectious disease we isolate the disease, we don't say, go for it, rely on your immune system.
You can save space by having the return chamber combined with filter sock area. Have the intake go right into the sock...save you 8 inches right there. I'd want the fuge before the skimmer to get exposed to dirtier water.