i have set up my tank so it has a bulkhead near the bottom of the tank with a ball valve and a garden hose and drain as much as i want. then i have a extra pump that i pump my new water in with. works well
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150 gallon reef mostly softies/lps. 50 gal sump with bubble magnus skimmer/ Led fuge light/refugium/ 1200 return and tunze powerheads. Dual pharoah main tank led.4 pump dosser.
550 gallon stingray tank water drip system
150 bowfront. 75 turtle tank, many others
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