Random Aquarium Topics

Dissolved Oxygen

Marine Topics - Water Quality
Nudibranch - The nudibranch has external feathery gills on its backIt would be true to say that the majority of aquarists never test for dissolved oxygen (02). Nevertheless, oxygen is an extremely important gas and essential for the survival of the vast majority of livestock that we keep. This is, of course, most evident in fish, which draw oxygenated water in through their mouths, passing it over oxygen extracting membranes within the gills and expelling the depleted water out through the gill slits.

Raising Clownfish

Marine Fish - Clownfish

Clowns Spawning Family: Pomacentridae

The spawning of clownfish nearly always takes place in the late afternoon and is a delightful scene to observe. A common precursor to this and a good indication of imminent egg laying is the ritual cleaning of the chosen spawning site. Both male and female clean the site vigorously with their mouths until they are both satisfied that the surface will be suitable. Meanwhile, the egg laying tube, or ovipositor will have become clearly visible in the female, while the male's fertilisation tube may only just be obvious.

Majestic/Bluegirdled Angelfish | Euxiphipops navarchus

Marine Fish - Angelfish

Majestic/Bluegirdled Angelfish - Euxiphipops navarchusLike most other marine angelfish this species is another true beauty. One could say that it runs in the family. Adult and juvenile Majestic Angels (Euxiphipops navarchus) also known as the Bluegirdled Angel differ greatly in coloration. This above pictured specimen has begun its transformation into the adult color pattern. A complete juvenile has no orange color at all and the electric blue bands extend into the dorsal fin. The adults are bright orange with many blue dots in the mid-section of the body. The dorsal fin and tail are fireball orange with an iridescent blue border edging. Its face also turns bright orange from below the eye and extending along the gill plates towards the anal fins.

New Marinists Are Welcome

Marine Invertebrates - Invertebrate Systems
Cleaner Shrimp (Lysmata grabhami)Newcomers, beginners, novices, call them what you will, are the lifeblood of our hobby. They are often confused and discouraged by the ‘rocket-science’ offered by hobbyists at the other end of the scale (and THEY were all newcomers at one time don’t forget!). This is a pity, for without fresh input, our hobby would soon start to decay!

If you are new to the marine fishkeeping hobby, I offer you a personal welcome and will do everything I can to make your transition to experienced enthusiast as painless as possible. If you have not already read the FAQ’s page then you will find plenty of basic information there to think about.

Big Fish for The Marine Aquarium!

Clown Trigger Fish (Balistoides conspicillum) One type of marine aquarium never fails to create a stir, the fish-only tank containing BIG fish! The sight of large slices of brightly coloured piscine flesh cruising around an equally spacious aquarium is enough to make anyone's heart beat a little quicker.


The Micro Shrimp Tank

Blood Shrimp (Lysmata debelius) Most of my regular readers will already be aware that, on the whole, I do not condone small marine tanks; that is, tanks with a nett volume of less than 20 gallons (91 litres). They are usually very unstable as far as water parameters are concerned and subsequently exert...


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