Sorry taking ages to reply didn't have a notification to say I had a reply the u3 u4 are made by fluval. Yea that's true about the siphon prob would be hard to do a vac. Yea I know what you mean about being on your belly to view or to check on them


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Hi just thought I'd pop on here looking at getting a zebra tank in a few months got my eye on a tank it's a 70 litre superfish one but will have a few adjustments like new heater also not sure of the filtration looking at running and internal rather than external as I can't run an external due to it...