Saltwater Aquarium/Expert Profile

David Ocreef

On Vacation
returns 12/31/2017

Technical saltwater coral reef related aquarium questions are welcome. Coral, invertebrate, and peaceful species of saltwater fish questions are welcome. Questions asked on Saturday and Sunday will be answered the following Monday. REMINDER: Please check the answers pool to see if your question has already been asked and answered. Questions typically are answered within a 48 hour period, however sometimes it may take longer.

Experience in the area

I possess over twenty-five years of hands-on experience and knowledge in the ecology of aquariums. Beyond the traditional, I have successfully tested and sustained environments that have been uncharted territories for hobbyists, for decades. I am the first to admit I don't know it all because there will always be something new, amazing, and exciting to learn about, as discoveries are made. It's a hobby one can never outgrow, or grow tired of.


MASNA - Marine Aquarium Society of North America. Director of Orange County Reef Aquatics -

Publications,, and many others.


After High School, my experience and love of marine animals influenced me to take up studies in Marine Biology. Throughout college, I studied Microbiology with an emphasis on Marine Life, as well as numerous other sciences. I continued to advance in this hobby, by building a dozen or more saltwater ecosystems all utilizing Microbes as the major source of my filtration method.

What do you still hope to achieve/learn in this field?

There will always be something new, amazing, and exciting to learn about, as discoveries are made. It's a hobby one can never outgrow, or grow tired of.

Something interesting about this subject that others may not know:

Some species of Modern Day Sea Urchins date back to the middle of the Triassic period, some 225 million years ago.

This expert accepts donations for Fish and Reef Conservation and Research:      

Average Ratings

Recent Reviews from Users

Read More Comments

    K = Knowledgeability    C = Clarity of Response    P = Politeness
Eugene 02/29/16101010Thanks so much it helps me a .....
Prashant S Akerkar10/27/15101010Dear David Thanks. Thanks & Regards, Prashant .....
Marge04/17/15101010David is extremely knowledgable and very helpful .....
Maggie12/25/14Thank you for your speedy informative response .....

Recent Answers from David Ocreef

2016-02-29 Saltwater Aquarium:

Hi Eugene:    THANK YOU FOR THE 5 STAR FEEDBACK, IT'S GREATLY APPRECIATED.    In regard to the live rock... if you want your live rock to become encrusted with that beautiful purple Coraline algae that

2016-02-26 Saltwater Aquarium:

Hi Eugene:    Since your water parameters are testing fine, it's sounds like it diatoms that are turning the sand this brown color. If you don't know what diatoms are, they are a major group of algae and

2016-02-15 Filter:

Hi Catherine:    Welcome to the world of saltwater aquatics.    From my years of experience, and since saltwater aquariums need to be kept pristine to sustain delicate invertebrates, saltwater fish and

2015-12-20 fish:

Tropical freshwater fish including Goldfish and Bala Sharks may survive up to 2 weeks without being fed, because they can survive on algae and other micro-organisms already in their tank... not that you

2015-12-01 Devoid of Natural Sunlight:

Hi Jem:    While nothing can ever reproduce the suns natural rays, years of studies, evidence, and home aquarium enthusiasts have all shown that by using full spectrum Metal Halide lighting, Power Compact


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