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Big clown - Thanks for link, that's even cheaper. Decision made, liquid carbon for the foreseeable future. See how I get on with it, or more importantly the plants. I didn't see a problem with the API stuff being £6 per month so the TNC carbon will save me a few dollars. I'll go and work it out in a minute.
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Ian - Thanks for all your replies and links. Looks like a dosing pump may be on the list of things to get. I'm shopping this weekend for the extra light, so I'm going to opt for a single 54w instead of the double, but I do think I need 1 more at least. The 2 39's currently on the tank are at the back above the wood, between the 2 overflows (aquaflora) and the front (midday 6000) The 54w would obviously go straight through the middle and reach end to end, but unsure now if to go for aquaflora or midday?
The tank will be running exactly the same wether I'm there or not. Daily dosing of carbon, ferts and a 10% weekly water change. The only difference really, is that I'll only get to prune and tidy the tank up every 3 weeks. The 10% water change is the maxium I can get away with while still leaving the return pump running and taking from the sump and not having to mess around in the tank itself. Obviously I can up this to 2x10% changes per week, Wednesday & Sunday for example, to give a 20% weekly change, if required. The dosing pumps will obviously make things easier, but is it just another thing that go wrong when I'm away?
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stuworrall - Thanks for the reply. Your point about losing Co2 on an open sumped system made the decision to go liquid. High tech, low tech, is there a medium tech? Think I want to fit into that bracket
I've worked the price of liquid carbon out and don't think it's too bad TBH. No you haven't burst my bubble, better to know about possible problems before they occur. Thanks for admiring my wood