So, another update.

I've put new bulbs in, added a small internal above the CO2 diffuser, fiddled with the other filters to get better flow, planted bigger swords from another tank, added other plants - egeria densa, cabomba and 3 large Alternanthera Reineckii. Despite have Eco-Complete under the gravel I've added root tabs for the swords and Reineckii.

Happy with the way it looks and all the plants are south american. Got a calculator out and discovered I actually have 1.9wpg, not 1.7wpg as previously stated.

Last weekend I finished the blackout, so far at Thursday this week no sign of any algae whatsoever.

The only problem I've had are the Festivums nibbling the Reineckii, but as soon as I add courgette their interest goes their instead, so guess I'll just have some in most times.

Thanks for all the help, fingers crossed!