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I'm preparing my shopping list for this Saturdays trip to my local LFS(FAOIS). So far my list consists of the following:

Replacement Filters for RO/DI, Calc/KH test kits, Salt.

Here's where I need advice. I have an OLD Nova Extreme 8x54w T5HO fixture with the single reflector. It's not ideal, and bulbs are 13months old so they need replacement. I bounced a couple of ideas around. I would hate to spend the money on new bulbs for a fixture that isn't ideal, and that ...