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Ok, I think I have realised what the problem is. I think the tanks are slightly lower than the cartridges, at the base of the printer, so the ink is flowing back up the tubes. Just incase anyone is having the same problem.

This may have been asked before, and if it has sorry, anyway... I have a CISS for my Epson R1400 and I recently noticed that the ink keeps, what I can only assume is, expanding due to possibly heat variations in my house. The ink is expanding up the tube in the tanks and through my air filters...