Aquarium Advice

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How to keep Discus

Discus are highly sought after and regarded by many as the kings of the freshwater aquarium. But there are a few things you need to know about before you keep them. Discus are cichlids, meaning that they demonstrate brood care and protect their eggs and fry from others. They are pair forming but when not in a mated pair they are shoaling species and feel more comfortable in large groups....

How does an aquarium sump work?

Sumps can be used on any aquarium but are most popular with marine keepers. In essence, a sump is another aquarium attached to the main one. They are usually placed in the cabinet underneath but can even be placed above a tank and run “upstream.” Multiple tanks can be attached to one centralized sump, and that method is popular with local fish stores for keeping lots of fish in lots of tanks ...

What gravel do I need for my fish tank?

Aquarium gravel comes in all shapes, colours and sizes but some suit some fish better than others, while others may be unsuitable for certain types of fish or aquarium. Freshwater or marine?Freshwater tanks need freshwater sands and gravels, whereas saltwater tanks need marine substrates. The main difference is that marine sands and gravels are made up of pieces of coral and shell, w...

How to do a partial water change in a tropical fish tank

Swell UK Common Fish Diseases

“Do a partial water change,” those are the words you’ll hear often as a fishkeeper but what does that mean and why and how can it help your situation? When we’re dealing with ponds and aquariums we’re talking about closed bodies of water. In nature, pollution is diluted or washed away but in small, closed bodies of water like our tanks and ponds, waste builds up. Everything tha...

How many fish can I put in a Fluval Flex 57 litre aquarium?

The Fluval Flex is a modern-looking aquarium with a funky shape and large filtration capacity. At 41x39x39cm it holds 57 litres/12.5 gallons, which is about the same volume as a standard 60x30x30cm, or two foot tank. Its 19cm shorter, however, so this needs to be taken into account when selecting the fish species that you are going to put into it.The fish that we recommend are based on maximu...

What causes high pH in a fish tank?

High pH can be good for some fish that naturally inhabit hard, alkaline waters like Lake Tanganyika cichlids, Malawi cichlids and Sailfin mollies. For them a pH between 8 and 8.5 can be a good thing, so the first thing to do is to test the water with a pH test kit. Test the tank water and the tapwater you filled the tank with, and see if they are the same. If your tapwater has a high pH of s...

Why are my fish swimming at the top of the tank?

The first thing to check would be oxygen levels. Check that the filter is plugged in and switched on and that the water is being agitated and rippled by the pump. If you have an airpump, check that it’s producing bubbles in the water.If oxygen levels are low, fish hang at the surface and gasp, as the surface has the highest oxygen level in the tank because its in contact with the air. If ox...

How long should a UV light be on in an aquarium?

Selection of tropical fish

An aquarium UV steriliser should be switched on and running for 24 hours per day, every day. Exceptions would be setting the tank up before there are any fish in it, adding beneficial bacteria to the water, as UV light kills bacteria, or if you are using a medication that stipulates that UVs should be turned off.Some marine keepers like to run UV intermittently to allow phytoplankton and zoo...

What to feed corals in a reef tank

One of the greatest advances in reefkeeping in the last few years has been in nutrition. Photosynthetic corals get nutrition in two ways - via their symbiotic relationship with photosynthetic zooxanthellae algae during the day time, and via their polyps at night time. And its advances in feeding the actual coral polyps, along with improvements in lighting, which has meant that corals can now feed...

How to keep your tank cool this summer

The weather has been absolutely glorious, with May being the hottest since records began, but where does that leave your fish? Even tropical fish don’t like it too hot, and for the first time this week my tanks went over the temperature I set them to on their heaters. The perfect temperature for most tropical fish is 24C, and that’s what my heaters are set to. But on Sunday outdoor t...

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