All posts by Jeremy Gay

Jeremy Gay is an author, lifelong fishkeeper, and aquatic specialist. He's a former editor of Practical Fishkeeping Magazine, UK editor at Reefbuilders, a former aquatic store manager, and has collected fish in Sri Lanka and the Amazon. He's been on tv and radio, contributed to Koi Carp and Gardeners World magazines, been a product tester, a judge, and a product developer. Jeremy is here to guide and advise you on all things tropical, pond and marine, from set-up to stocking, health, feeding to breeding, as well as solving many common fishkeeping problems along the way.
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What is the best food for marine fish?

Marine fish have evolved to take advantage of all the different types of food that are available in the ocean. Foods vary from phytoplankton to zooplankton, macroalgae to mobile invertebrates, coral polyps and even other fish. Some fish are omnivores and are easy to feed in our aquariums, while others are specialists which struggle to feed on items that are different to what they would find in th...

How to clean an aquarium filter pump

Most fishkeepers know about the importance of cleaning filter sponges, and to only ever do it in old aquarium water, not tapwater. They also know to replace white filter wool and polishing pads when dirty, and to replace carbon every 30 days. But the filter pump itself, the beating heart of the filtration system also needs maintenance too. A typical scenario goes like this: You switch th...

How many tropical fish can I put in a 40 litre tank?

Honey gourami

Fish stocking levels rely on several factors including the type of filter used, the amount of food that’s fed, the maturity of the biological filter, water temperature, tank surface area as well as the type of fish! Despite this, if the aquarium is more than six weeks old and has a mature filter, here are our recommendations.If the fish are an inch long like Neon tetras, White Cloud Mountai...

What order should I add livestock to my marine tank?

Reef tanks take time to mature and within that time conditions may not necessarily be at their best for all inhabitants. Because of this, we mature tanks slowly, adding livestock a bit at a time. We add the hardiest creatures first and the most sensitive ones last. Mature the tank firstThe first water quality issue will be ammonia and no living creature should be exposed to that. Fis...

How to set up a quarantine tank

Quarantining newly purchased fish is so important as we can’t see if they are carrying parasites with the naked eye. Set up another tank to introduce fish to first and you’ll have a chance to properly acclimate them, get them feeding and rested, identify any health problems and treat disease if necessary. A quarantine tank can double-up as a hospital tank or even a breeding tank too. Here’s...

How to aquascape a freshwater aquarium

Aquascaping doesn’t have to be the sole domain of planted tank owners and literally just means landscaping underwater. Or even landscaping with water in the case of a garden pond. It’s more about design, and by using a few simple design principles you can make any aquarium look good, large or small, goldfish, cichlids or a community tank. HardscapeHardscape is the term given to r...

What other animals can I keep with fish in my aquarium?

There are several tempting non-fishy animal species aimed at the sale and keeping in fish tanks. But are they suitable to be mixed with fish? Visit your LFS and while looking for an interesting fish to buy you may well spot something else. Snails, crabs, shrimp, crayfish, frogs, even turtles, but unfortunately most are best kept separate from fish because they either eat fish, or they themselves ...

What do I need to set up a marine aquarium?

Marine fish tanks are so cool, and there’s no better hobby to start while you’re stuck at home. Here’s what you’ll need:TankChoose a model from 50-500 litres to get you started, but note that you’ll need a tank of 300 litres and 120cm in length minimum to keep Tangs long term.LightIf you want live corals and anemones you need good light. Choose high-powered controllable...

How to build an aquarium – DIY fish tank

In the age of YouTube videos on how to do absolutely everything, the temptation might be to have a go at building your own aquarium. Its only five panes of glass after all - right? But it’s not quite that easy…Take a look at your aquarium up close and feel it with your fingers. It will have neat silicone lines, smooth, polished edges to the glass and the corners are all square. It may hav...

What causes low pH in an aquarium?

A number of factors can affect the pH in an aquarium and lower it. The first factor is the source water. If your tap water has a low pH and you fill your tank with it, your tank water will then also have a low pH. The pH of tap water can change occasionally so if you experience a drop in pH in your tank and you’ve just done a water change, check the pH of the tap water too.If the tap water...

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