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The MARSI tank runs with a commercial undergravel filter 

Our objective is to demonstrate that it is a valid and performant alternative: for SBM members who have neither the workshop or ability to assemble the SBMarine Biological Filter. We used Lee's Undergravel Filter

(available at MOPS see LINKS in second menu)

We started cycling the tank July 6 2017. In August: ZIPPY occupied it for several months.

In January 2018 MARSI was introduced. It hosts all the basics:

'Pods, Algae, Asterinas, Limpets, three Nassarius.

Gaïa & Pyxis have never done so well: we'll get into this in detail later...

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Lighting is provided with four 13 watt CFL bulbs (two blues & two 6,500 Kelvin). The filter is powered with two standard air pumps of 3,5 watt & 2,8 watt. A sponge filter will be added in a few weeks to further - polish - the water. A Natural Sea Salt Mix (H2Ocean) provides a higher magnesium content. For details on SBMarine's method of preparing such salts see link below:  

To successfully maintain Premnas biaculeatus in captivity...

you must first understand their behaviour in the wild

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Yup... perfectly Balanced and Stabilized... the MARSI tank has all the basic essentials

life is teeming here... and life is what interests us at SBMarine

This LINK pertains to freshwater Gammarus shrimp but it is related to this topic


We use the DANNER AP-3  (2,8watt) Air Pump wherever lifting water is required without powerheads. It is extremely quiet, rugged, reliable and EASY to Service. Without expensive and/or poorly designed modules.

For extra - polishing - of water: Aquarium Solutions has the nec-plus-ultra of sponge filters (bacto surge sponge filter) !!  It is unique in it's design since it uses no air stones: the integrated air diffuser puts no back pressure on air pumps, is easily cleansed with a brush through the detachable base. It requires low maintenance since it does not clog for months on end !!! Even the type of sponge material is far ahead of any other. 

BOTH are offered through Mail Order Pet Supplies (MOPS) 

see LINKS in second Menu

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MARSI is comfortable in this tank now and acts as a perfect host to Gaïa and Pixys. So her lighting was upgraded this morning to one 20/23 watt 6,500K CFL bulb and three 13 watt blue CFL... It's the same setup ROSA had...

Gaïa's own private Stonehenge... She really is capable of Megaworks !

She has delimited the territory to the left... in centre with small rock... and algae to the far right... This is what she calls home.

Last year Gaïa looked like a white banded Premnas... but we had a feeling she would turn out to be a Yellow Banded Marroon Clownfish: as you can see she is. 

More than with any other clownfish specie: with Premnas the male is typically assigned everything that relates to the anemone... All the rest is up to the female.

In the wild, Maroon Clownfish will spend their whole life with their anemone (20/25 years) like other species... However the similarity ends here. A mated pair will keep their host to themselves... without any other Premnas around or on their territory which is delimited by the female. No sibblings will be allowed to share host anemone with the parents. Upon hatching, Premnas fry are already on their own and will be chased or killed after a few days only. They must either swim or drift to a location of their own...


Like all clownfish we don't consider them to be community fishes. Anyway we don't see the need for it since they are a world of delight by themself anyhow. Besides they can be kept in smaller tanks without tons of useless LiveRock that take away priceless water volume and invaluable swimming space !!

As we often mention: Symbiotic Anemones, Rhodactis & Discosoma  and Cerianthus do not belong in reef tanks... So a smaller tank is perfectly suited for Maroons and their Host.


Premnas will only thrive in captivity if given: a tank, an anemone, and a territory that they can model to their convenience... And the owner or caretaker has nothing to do with any of the management involved !!

If you don't agree then don't get Premnas in the first place !! Your responsibility as a caretaker is limited to providing optimal tank conditions and advanced feeding methods.


Premnas also determine what other life forms live or die around them. In the MARSI tank for instance something exceptional happens with Amphipods: they roam freely in the tank during daytime. Premnas show no interest for them as long as they are not swimming... Gaïa will instantly catch any free swimmers !!!


Please take note that female Premnas will not only defend their territory but also their mate... no matter what !!! Also exceptional with Premnas: females are five to six times larger than males. It's not an age difference but merely a difference in size... 


NOTE: Premnas biaculeatus have a scalpel on each opercule like Angelfish. It is best to catch them with a bag than a net in order to keep it intact.



It's no hoax ! They live and reproduce here...

in a Marine Biological System

... but other Life Forms reproduce and live at SBMarine:

let's see if your sense of observation can let you identify this one (?)


yes... the pictures are blurred of course: couldn't make it too easy now could we... hehehe...


HINT No 1: you can see an eye


HINT No 2: they vary from 1/2 to 1 1/2 mm... for now.

A very small amphipod is seen at right...

We'll give you another hint tomorrow

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HINT No 3: Congratulations you figured it out... however don't expect any follow-up soon...

We will be busy compiling advanced notions about this issue and it requires time as you well understand. 

SBMarine is a Marine Reproduction Center

we are not a commercial fish farm - nor a local fish store - neither an online fast shipping outlet

We are known for our integrity. We don't sell impossible dreams and therefore only document and illustrate the essential and advanced notions required to establish and maintain healthy Marine Biological Systems. We don't hold all solutions or answers... we do make mistakes but will not broom them under the carpet: If so you will be the first to discover the reasons for success or failure at our Lab. Maintenance of Marine tanks is a continuous learning process and we are more than eager to provide you with the best in-depth perspective as possible on any given topic. Today the MARSI tank offers a tremendous challenge that will maybe require many months of trial and error to determine valid Advanced Notions. Some elements of this ongoing process will be treated seperately in an Advanced Special File. You will witness each step we take.

Yes Gaïa & Pixys have spawned. But countless questions arise as to what approach is best suited for a Marine Biological System... It involves the behaviour of fishes, nutrition for the fry, compatibility, etc... and also Treatment of Fishes. From all her aquascaping and bulldozing activities Gaïa has minor abrasions, scratches and bruises, nothing serious, but enough to damage the protective mucus... So we will be looking at what is best for her, for the couple, for the fry, for MARSI, for the 'Pods and so on. 

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Gaïa & Pixys: first documented spawn

5:30 PM - (22/04/2018)