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Any recommendations for an external inline pump with a decent head? The tank is 200+L and has a canister filter - I just need something to boost the circulation. I doesn't need to have a massive LPH, but it does need to maintain a decent flow when pumping up around 1.5m.

I'm looking for an external circulation pump that is capable of a decent flow rate with a head of about 1.7m for a 250L tank. There seem to be 1000 options, some with astronomical price tags, so any first hand recommendations would be appreciated. Thanks.

In reviewing my filtration, I keep reading about pre-filters. I don't currently use them. As I understand it, they are basically just a piece of coarse sponge over the intake of a canister filter. I've also read quite a few recommendations about cleaning pre-filters regularly, whilst cleaning...

Having read various recommendations on media, I had understood that course foam media should go before ceramic bio media, which could even go last? I wasn't sure whether my filter was top-to-bottom or bottom-to-top, so I RTFM'd. The instructions clearly suggest bio-media should go first. Your...

To combat a BBA problem, I'm looking at my filtration and aiming to improve flow. Having read comments from the UKAPS gurus, I'm planning to remove the ceramic tube type bio-media from one of my external filters. (The other just has sponges.) I've read that "organics" (what ever that amorphous...

Having found 6 fish and 3 shrimp in one of my canister filters, I'm planning to put sponge pre-filters on the intakes. (My pipework is DIY Acrylic.) I've always avoided these as I felt they must hold the filtrate in the tank, and reduce the amount that makes it through to the canister. Any...

I have two external filters for my tank. Filter 1 is used as a conventional filter. Filter 2 has been more of a circulation pump , albeit a slightly under-powered circulation pump. In the process of a tank revamp, I've added some filter floss to Filter 2 and, when trying connecting a gravel...

A few years ago, the Fluval FX filters seemed to be regarded as the mutt's nuts. Is there anything better at the moment in the price range or equally good but cheaper?

Does anyone have an Aqua-Turn AT2525 adaptor for a Grundfos 15/50 or 15/60 central heating pump? I have another brand of central heating pump that I suspect is just a re-branded Grundfos, but other than mounting bolt spacing for the impeller housing, I can't get any measurements out of...

Is there any good reason not to use standard plumbers copper pipe to make custom lilly pipes etc? I've read that copper is bad for fish and inverts, but AFAIK most domestic plumbing uses it, so most water in domestic aquariums has been through copper. Right?

I know there used to be someone who sold adaptor kits to run Grundfos central heating pumps as aquarium circulation pumps, but they don't seem to be available any more. Does anyone have any current knowledge of these, or know of a good (cheap) alternative?

I'm a lazy aquarist. Right. We've got that out of the way, now lets move on and get to the point ... I've got out of the habbit of maintaining my 250L tank, and despite an attempt to get it back up and running about a year ago, it has now been all but unattended for 18 months. That said, both...

I have an external circulation pump that has died and a Rena XP2 canister gathering dust. Is there any good reason not to remove all the filter media and baskets from the XP2 as just use it as a circulation pump?

After talking to soneone at my LFS (another customer) I am wondering about swapping my canister filter for a sump filter on my 250L tropical tank. Q1. What are the pros and cons of sump filters? Q2. Everthing I can find on sumps is for marine tanks, which usually seem to have wiers built into...

I recently had to replace my filter and bought one from JBL. Based on reading I did when I first started keeping fish, for years I've been aiming for a 10% - 20% water change, ideally once a week. At the same time I'd rinse all the filter media in tank water I was going to throw away, so as not...

To combat algae I've recently increased the flow in my tank by adding a Hydor external pump, plumbed in to a second spray bar. In the diagram, my EX1200 feeds the red spary bar and the Hydor pump feeds the blue one. (NB Not to scale: the tank is about 2'6" deep, 1' back to front, and 3'6"...

For some time now my filter has acumulated some sort of grey/brown sludge. It's most obvious in the corners and on the bio-balls where the flow is obviously slowest, and where it's hardest to clean out. What is it, is it harmful, and if so, how can I get rid of it?

I have an EX1200 which I guess is about 3yrs old. I can't be sure, but I'm pretty sure the flow rate it produces has dropped significantly since it was installed. (It is a little hamstrung as it has to pump to a height of about 5ft, but that has always been the case.) All the pipe work has...

I'm adding an external circulation pump to my 2'6" deep 220L tank and need to make some custom pipes for it. I currently have an EX1200 with an inlet at the bottom back corner or the tank and a spray bar across the back or the tank. What sort of positioning should I look at for the in/out-lets...

Can anyone recommend a lubricant that's not oil based and is safe for aquarium use?

This is a major **** up, I know. Please don't ask how it happened, or tell me how important it is not to let it happen, or how to stop it happening. The situation was entirely beyond my control. My filtration has got blocked, and the water has not been changed for several weeks. The result is...

I'm about to re-plumb my tank and add a second pump to improve the circulation.The tank is 2'6" deep, and the surface area is just 3.7 sq ft. In order to improve flow at the bottom of the tank, I've been wondering about having the outlet for one pump as something other than as a spraybar at...

I'm going to remake my filter intake and return pipes in the near future. As my tank is about 30" deep, any thoughts on how long I should make the filter intake sieve?

I've been looking into water purification (in adition normal filtering). I don't want to go for RO, but have come accross HMA filters as a possible haf way house. Except I can't find any info on what they actually are and how they work. Can anyone help?

Does anyone know how much pipe diameter and length effect flow rate? I know it's not a simple relationship, and I don't want to get into complicated maths, but it would bs useful to know roughly.

Having read through some of the posts on flow etc I am concerned my project may be heading for some dead spots and risk of algae. The tank is just over 1m wide, 75cm high and 30cm deep (about 250l), with two large pieces of wood and a relatively large cave. The filtration is from a Rena xP2...