You might be as well off to invest in an electronic ph tester. They are very accurate if you keep them calibrated and you can pick one up for less than £20, which will work out cheaper in the long run anyway
I would have thought that if they can take a 70w or 150w bulb as supplied then if it wasn't the right spectrum for marine tanks they could possibly be swapped for marine specific bulbs, or am I just being thick
Re: eeek can someone help tell me whats happened.
A few years ago (well 18 to be exact) a red mushroom in my tank began releasing what looked like little blue brains into the water, when these were inspected further they were little sacs filled with individual blue balls. This happened over a 4-6 hour period and I was quite worried at the time. I had to trawl through umpteen books before realizing they were eggs, no internet back then. Nothing became of them as they were all promptly scoffed by the fish. Oh well!
Would the metal halides I saw at www.lightsaver.co.uk be O.K for an aquarium. They can be found under specific lighting. I know they would have to be protected from the water in some way but other than that I can't see why not.