Thanks - my details are as follows:
- Fluval Roma 240 litre tank (4 foot long, approx 50cm deep) with a Fluval 406 external canister (upgraded from original 306), established for 8 months
- Fertiliser - Easylife Profito 4ml daily
- Light - newly acquired Fluval Plant 3.0 on the default "planted tank" setting, 6 hours daily, plus an hour of sunrise/sunset on either side
- Easycarbo - just started using, adding daily, working up to 8ml a day i.e. the "heavily planted" recommended dose
- fish - neon tetras, harlequin rasboras, honey gourami, otos and aeneus corydoras - fully stocked (Aqadvisor puts me at 95% ish for whatever that's worth)
- very soft water (1-2 degrees of both KH and GH, though I supplement with potassium bicarbonate to get the KH to 4-5), pH 7.4 (after supplementation), temp 24 C. I don't supplement GH as I have soft water fish but not sure if it would benefit my plants to do so)
I can change most of the above apart from the fish. I have looked into pressurised CO2 and for various reasons it's not an option at present. But open to any other suggestions.
I like the jungle look! This sort of thing:
https://www.ukaps.org/forum/threads/low-maintenance-jungle-set-up.20627/
Thanks very much for everyone's help.