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You are here: Home Volume I February 2002 Feature Aquarium: The Aquarium of Leonard Ho

Feature Aquarium: The Aquarium of Leonard Ho

By Leonard Ho Posted Feb 14, 2002 07:00 PM Pomacanthus Publications, Inc.
Leonard shares the setup and husbandry of his 120 gallon reef aquarium.

My 6 year old reef aquarium is a 120 gallon (48x24x24"). The all-glass tank was built by LeeMar of Southern California, and incorporates a lot of desirable features I was looking for: "Euro style" top bracing, black silicon joints, beveled corners, and reef-ready rear/center overflow partition. The tank sits atop a pine stand built by a local craftsman. If I had the tank to do over again, I would've coated the interior of the stand with sealant for added peace of mind.

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Philosophy/Methodology

The tank was conceived around the idea of a highly diversified invertebrate community. Community was originally to resemble a Pacific back-reef biotope, although some deviations from the original mission have occurred throughout the years. I also grew fond of exotic fish, and the acquisition of fish also migrated to the top of my agenda; however, fish must be invertebrate friendly. From its inception (before the acronym DSB was coined), I used a 3-4" sand bed, assisted by a protein skimmer and minimal micro and macroalgae scrubbing. There is no one preferred methodology; rather, the tank is a combination of methodologies that have worked for me through my 15 years of reefkeeping.

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Water Circulation

I employ two main circulation pumps to provide water movement: an Iwaki MD30LRXT and an Iwaki MD30RLT. A 1" Sea Swirl is used to provide turbulence. A Tunze 2002 air-cooled powerhead is also utilized for additional circulation. I emphasize pump redundancy in case of failure. Never put all your eggs in one basket.

Additional Equipment

A Neptune Aquacontroller controls all my devices. Cooling is accomplished with a AquaLogic 1/3hp Delta chiller. Heater is accomplished with a 300W submersible Visitherm.

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Lighting

Lighting is provided by 2 x 400W Ushio 10,000K lamps, powered by two DIY magnetic core/cap M59 ballast. Spider light reflectors are used for both halides. Actinic supplementation is provided by 4 URI 110W VHO bulbs, driven by an Icecap 660. Having experimented with every MH bulb commercially available, this combination provided the best balance of personal aesthetics, coral growth, and pigment rendering.

Filtration

A Euro Reef CS6-2 serves my primary filtration system. TLF Hydrocarbon is used passively two weeks per month (although I've been known to be lax about replacing it). Microalgae are sporadically harvested from the overflow, and macroalgae from the display. Polyfilters are used after spawning events.

Calcium & Additives

Because of the density of hermatypic organisms, I employ multiple calcium/additive devices: A Geo dual chamber calcium reactor (with aragonite media), a Ecotech Marine kalkreactor (fed fresh R/O via a Litermeter dosing pump), and manual additions of ESV B-ionic. No other chemical additives are used.

Feeding Regimen

I feed a variety of foods. Fish are fed 2-3 cubes of frozen Ocean Nutrition Prime Reef soaked in Selcon, dispensed 1-2 times daily. I target feed my Coco Worms a mixture of DT live phytoplankton and Liquidlife's cyropaste Bioplankton. I plan on trying Golden Pearls as additional nutrition for the worms. All other inhabitants feed on whatever is not consumed from these target feedings.

Maintenance Regimen

I admittedly perform very little water changes. In the past year (2001), I did two small 20 gallon water changes. I recommend water changes, so please do not follow my lead. The maturity of the tank may partially offset my leniency in water change schedule. Other then that, I do very little by way of maintenance, which consists of cleaning the glass, replacing media, and changing perishable equipment.

Current Inhabitants

Current fish population includes: Black Tang (Zebrasoma rostratum), Chevron Tang (Ctenochaetus hawaiiensis), Five Bar Wrasse (Pseudochelinus ocellatus), Peppermint Hogfish/Wrasse (Bodianus masudai), & Cap Clown (Amphiprion leucokranos). Some fish are fast approaching 10 years in captivity.

There are too many invertebrate species to list. Rough estimation of introduced decorative animals include ~40 SPS colonies, a dozen soft corals, a dozen LPS corals, numerous mushrooms and polyps, and 8 "ultra" Tridacna clams. Several corals are well over a decade old under my care.

How/Where did I acquire my species:

To be honest, I can't recall where I got most of specimens. 80% of my SPS (small polyp scleractinian) were grown from captive grown fragments. The rest of my specimens were assembled from at least a dozen different sources. Wild colonies and fish were purchased through various mail order outfits as well as local fish stores and wholesalers.

Chemistry

My NO3 levels were 5-10 ppm last time I checked. My PO4 was undetectable with a Salifert Test Kit. It's admittedly been a long time since I last tested my tank - probably around a year. I approach tank care nowadays in a very "biological" perspective; That is, I judge how my tank is doing by observing my organisms. Not recommended for new tanks, mind you. But mine is 6 years old :-)

Other pertinent stats

  • pH: 8.0-8.5 (high because of kalk)
  • alk: 8-10 dkH
  • Ca: ~350ppm (can't get above this threshold)
  • S.G. 1.025 (temp compensated refractometer)
  • Temp: 78 (winter) to 83 (summer)
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Anything else notable about my tank

The most notable tidbit about my tank is that my invertebrates regularly spawn. Spawning occurs sporadically all months of the years, with one major mass spawning event around September. Spawning occurs with more than half my Cnidarians, including my anemone. Oddly enough, my clams have never spawned.

Also, for a skimmed tank - one without a refugium and several predatory fish - I have a surprising dense and diverse population of plankton. Sponge and tunicates plaster all the cryptic passageways, and feather dusters, copepods, amphipods, polychates, and nematodes liter the substrate.

More information and pictures can be found at: http://www.reefscapes.net

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