This may help you when you get them:
Poly Filters will remove phosphate and heavy metals, and actually provide an indication of existing problems by changing color. Blue for copper. Orange for iron. Green for ammonia. Dark brown or grey when exhausted.
29gal BB | 42+ lbs LR
| 143watts PC
| Asst. Leathers, Frogspawn, Hammer, XLG Open Brain, Zoanthids, Mushrooms, Diploastrea heliopora | Blue Mandarin | Atrosalarias Fuscus | Pair Captive Bred Ocellaris Clowns | Peppermint Shrimp | 6 Astrea's |