Best Tropical Fish Tank Filter

[bleedingvalve]

Which is the best type of filter internal or external cost is applicable somewhere around £80 to £100

[Buenchico]

I'm out of my depth here but the following links might possibly help you:

Although this is a commercial site, where they'd like you to buy their own preferred products, the general advice about choosing a filter looks sound enough to me anyway:
https://www.allpondsolutions.co.uk/fishkeeping-advice/whats-the-best-filter-for-my-fish-tank.html

When trying to research answers for others asking about keeping tropical fish, I've always been impressed by the thoroughness of the information provided by Maidenhead Aquatics:
https://www.fishkeeper.co.uk/stories/choosing-an-aquarium-filter

The Fishkeeping World website might also be worth consulting:
https://www.fishkeepingworld.com/best-aquarium-filter/