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I absolutely would NOT dose without a skimmer. I'd also get rid of all those your FW filtration (canisters & filter pads) & get HOB skimmers for those tanks. FW filtration is largely based on mechanical filtration & large WC (yes, biological too). SW filtration is mostly biological, as it is $$$ to do large WC.
Also, if you're dosing VC, I'd discontinue the filter sock--it's gonna get really clogged really quick.
I'm not surprised you'd have issues in a predator tank. VC should help a great deal. I'd dose higher in a tank like that: 1tsp, 2x/day.
93g: 1/2 asp, 2x/day
What kind of skimmer is on tank 5?
2-4 WC/week on 5 tanks!? What kind of WC system do you use?
I only do 1/month.
yup pond pumps from lowesTeddy, Do you have something that pumps the water up the 50' tube?
What source of VC are you using & how much are you dosing? What's your magnesium level?