Prodibio is a decent ULN system. Its much more forgiving than zeo is, so it is great for people who don't have a lot of time to tweak or space to run the reactor.
Having used it myself for a short while I did notice a slight improvement in colors and growth in my sps corals.
However, if you want the crazy pastel colors and the like, it won't come close to what zeo can do.
However, since you have a mixed type reef, an ULN system may not be for you as some corals need the higher nitrate levels to grow and thrive.
That being said, there are various additives out there you can use without having to go with a full zeo or prodibio system. KZ coral vitalizer, reef fuel, sponge power, etc will still help without using the full system.
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32"x32"x20" Cube-ish tank
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