I had a similar situation. I found Accu-Clear gave great results for a one-off clarity boost, but I wouldn't use it as a regular thing (don't know exactly what's in it), you need to get the filter balancing on it's own. But for a quick aesthetic boost, e.g; a couple of hours before VIPs descend to inspect your new tank, it certainly worked for me. I was reluctant at first, but I thought I'd give it a go. I certainly wouldn't rely on it as part of a regular regime.
Far better to keep this to a minimum/one-off and use the advice already mentioned, plenty of regular clean water (discus love it), gravel/sand cleaning, etc, etc. And as Tolak says, ammo and nites...
Not a big fan of artificial stuff like that, but it's an option.