Oase swim skim great skimmer

Anyone selling a decent sized internal filter , ideally a fully submersible one . Very interested in whatever is out there between £10-£20 budget if good !

Hi I’ve got this see skimmer I’m trying to find a basket like this with smaller holes or find a way of customising this one. Has anyone else tried this and succeeded.

Anyone selling a box filter

Is anyone selling an external filter for a 200+ litre tank?