A quick look at my goldfish tank I have changed the standard Aquaone light as it is way to bright for a low tech goldy tank and replaced them with a freshwater maxspect R420r nano and built some new lids out of twin wall Polycarbonate
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https://www.youtube.com/watch?v=DoNRym-RDj0
I added some Salvinia Natans to the tank to give some floating cover to my boy. He got fully involved and built a nice big bubble nest the next day.
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https://www.youtube.com/watch?v=EGyt4TqlWYM
I got a seneye reef for the par meter but I have put the slide in to detect ammonia and PH level. Also having another go with a new wi fi controller for the plant 2.0
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https://www.youtube.com/watch?v=XIBPdMmR4Ro