Thanks Kimmy for your advice,
I was seriously considering adding some LR actually yesterday, but when I found out the price($8.00 /#)

, I decided not to add it at this time. My tank is fish only, and when I upgrade my size/system then I will add LR and corals.
But greatly appreciated your advice,

Lissa
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Fish only aquarium: 55 gal. Bio-Wheel Wet/Dry Biological Filter and the use of Pura Complete and a Nano Skimmer : Fish: Yellow Tang, Pacific Blue Tang, (2) Percula Clowns, (3) Green Chromis, Skunk Shrimp, Cleaner Wrasse, (5) Hermit Crabs, Yellow Tail Damsel, Four Stripe Damsel.