According to Scottish Water, I enter my postcode, the nearest site is Blairlinnans North. Soft Water.
Yes, very soft. Not a real problem, I have slightly softer water still, but it is important that we recognize this as there are some plants that will have issues, but many will be fine.
This does cause trouble for your livebearers though, the mollies and swordtails. They will have very serious problems long-term. Unless you are adding mineral to the tank, via calcareous rock/sand/gravel or something.
All of the other fish will be very happy in this water.
Now to the lighting, from post #15. Both tubes, Aqua-Glo and Power-Glo, are high in the blue and red (the colours that drive photosynthesis in plants) and with two tubes over this sized tank, no issues here respecting intensity. However, you could improve things by using a Life-Glo tube as one or both. Life-Glo has high red and blue but also green; this has been shown to improve the response of plants, plus it gives a truer rendition of colours. You need to replace T8 tubes every 12-16 months (meaning, before they actually give out) because they lose a lot of intensity as they burn, and past 12 or so months they are getting quite weak. You might consider the Life-Glo as one with say the Aqua-Glo.
So, having dealt with the light and determined the GH, we are left with the type of plants you had. As you need to acquire new plants, I would suggest you consider swords: the chain swords provide a nice substrate plant, and one of the larger Amazon swords would make a nice specimen plant. Stem plants like Ludwigia, pennywort, Wisteria should be OK. You will need to use fertilizer though, as these are fast growing and thus need nutrients beyond what the fish will provide.