Fluval P25 Submersible Aquarium Heater - 25 W Conditioners There are a few exceptions

There are a few exceptions to this rule: The males

but if the pH is higher than 5

Those products are generally acidic

This means that plants cannot divert iron from older leaves to new ones

Fluval P25 Submersible Aquarium Heater - 25 W Conditioners There are a few exceptionsFluval P Series heaters are pre set to maintain a consistent temperature of 24 26 C (76 78 F) in both fresh and saltwater nano aquariums. Key Features : Strong shatterproof polymer construction protect tank and inhabitants from damage Preset temperate requires no adjustment Waterproof, fully submersible design allows easy positioning inside aquarium LED running lamp illuminates to indicate when product is in use For use in freshwater and saltwater