Fishkeeping Advice

Fishkeeping advice answering all of your questions on keeping cold water, tropical, marine, freshwater and salt water fish.

We have a team of top aquatic experts on hand to answer your questions, email us at [email protected] and we'll pass your question on to the most relevant expert.

Slime molds feed on decaying organic matter, so their presence can indicate a problem. Image by Luke Glover.

What is this strange thing in my tank?

Practical Fishkeeping •

Serpae tetras are stunning, but renowned for fin-nipping behaviour.

What can I keep with this bossy fish?

Practical Fishkeeping •

What can I keep with this bossy fish?

Xenia is beautiful but it can be invasive in the aquarium.

How can I stop this 'weed' taking over my reef tank?

Practical Fishkeeping •

Airstones oxygenate the water, but the pumps running them can be noisy.

Can I get this pump to run more quietly?

Practical Fishkeeping •

Slime algae is linked to high nutrient levels.

How can I get rid of this slime?

Practical Fishkeeping •

Suckermouthed plecs are poorly suited to life in a mbuna set-up. Image by MP & C Piednoir, Aquapress.com

Can I keep a plec in my mbuna set-up?

Practical Fishkeeping •

Can I keep a plec in my mbuna set-up?

Firefish can be aggressive towards one another in the aquarium.

Can I keep a group of firefish?

Practical Fishkeeping •

Can I keep a group of firefish?

Did a Fork tailed blue eye introduce something nasty? Image by Alamy.

How do I worm my fish safely?

Practical Fishkeeping •

Dr Peter Burgess advises a reader who is having issues with worming their fish safely.

We've heard of several cases where pondfish have been eaten by otters. Image by Shutterstock.

What killed our Koi?

Practical Fishkeeping •