Filter For 30 Litre

[LolaLouie]

I just stupidly changed the substrate in my hospital tank from gravel to sand without thinking of the fact that it is filtered by an under GRAVEL filter!!

Anyway am now thinking i will replace the filter, but what filter do i need for a 30 litre?

I think an internal filter would be easiest. Could someone suggest some brand names, prices, sizes etc.

Thanks

 

[SJ2K]

These

Most of the smallest models of those will be alright although with 30l even the smallest internal is likely to make a bit of a tsunami

 

[OohFeeshy]

A hang-on-back one might be easiest, if the hood allows it. That way it's much easier to access the media without disturbing the fish and the flow can be easily adjusted.