I love my turkey baster! Especially for anyone breeding fish, they're great for collecting eggs, moving tiny wrigglers, cleaning out small containers, rescuing teeny fry from the bucket after a water change, sucking up uneaten food from a tank so you don't have to get a syphon and bucket out - so many little tasks that this £1 item has been useful for, I can't even list them all!
I bought a big bag of filter sponge
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have cut off sections for all of my filters, and a cut off piece is useful for cleaning the inside or outside of the glass, or scrubbing decor. Bought another bulk bag of filter floss the same way, and it's lasted for ages. Much cheaper than buying the silly little pre-cut things.
I've never had one, but if you have one of those filters that comes with "cartridges" that they say you have to change out a different one every month? It's a con! Stop buying replacements and adapt your filter to work how you need it to. You don't need phosphate remover and ammonia cartridges or carbon running all the time - it's just to make you buy (expensive) replacements all the time. No need. Adapt the filter with you own sponge/floss/ceramic media and the only thing you'll need to replace is the floss now and then. Sponges will last for years.
I picked one of these up from somewhere like Poundland once, and it's one of the most useful items in my "fish cleaning stuff" drawer.
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Stiff bristles mean it's great for things you really need to scrub hard, like stubborn algae on decor, wood or stone that you're planning to add to a tank, since the bristles are stiff but also not hard enough to scratch or cause damage. If you buy dragon stone, you have to really scrub at all the tiny holes to remove the clay and loose bits of stone before you can add it to your tank. This thing helped me out a lot doing that.
For anyone with a canister filter like mine, one of these is perfect for cleaning the muck out of the hoses:
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And for getting into nooks and crannies with all types of filters, and fish stuff that needs a scrub, bottlebrushes are super handy for all sorts of tasks.
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Edited because I know the difference between "loose" and "lose", and it's one of my pet hates when the wrong one is used! So I can't just leave it there when I did it, lol.