Mine has got to be: soaking and then scraping those nasty algae off the power heads. I soaked mine in vinegar for two days, and still scrubbed until my fingers have no skin left.
The other is algae growth in my tanks. And my "algae eating" tangs, blennies, angels won't touch them. My mexican turba snails do a great job, only on certain spots. It's just like they are saving some for future use or something!
Cost of the light bulbs that we have to replace at least once every 10 months or so.
And there are great stuffs for sale by Canreefers that's always too far for me to get to, and always when I don't have to cash to buy them!
I'm sure that I can think of more, but that's for another day...
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