Yeah, Solid Gold has some really good videos on YouTube. Her tutorials about how to care for goldfish, and all other fish in general are excellent. She has quite a bit of aquarium knowledge, and knows her stuff. Her videos are imo, impressive, and professional-looking. I heard she hasn't been uploading videos though ever since she introduced her fish room; might be because she has other things going on in her life; work/job, school, family, friends, vacation, personal reasons, etc.. I can understand that.
Anyway those are some great aquarium YouTube channels you guys mentioned. Awesome.
55 gallon Rainbowfish species/Harlequin rasboras community Dutch scape low-tech planted tank
60 gallon Bala shark low-tech planted tank
250 gallon Community Tiger Oscar/Red hook silver dollar/Silver dollars/BR Parrots/ PB Jack Dempsey/Clown loaches/Tinfoil barb/Roseline sharks/Barbs Monster fish tank