It does, but I have read that small water changes will not help in a situation like this. Do you think it will? If 20 gallons would be fine, that sounds more feasible. I've got 60 gallons mixing at the moment. Working on more. I'm really upset about it because everything, of course, is expensive and I had some really good growth on my monti's. My purple had gotten to be plate sized and was a beautiful dark purple. Now, it is half dead and brown. What should I do about the rocks and sand? Scrub the rocks in new saltwater??? Use a powerhead and just blow them off really well while doing water changes? Replace the sand or reuse and rinse? This will be a big chore. If I had done this to them by not following directions, they would make me pay for it. Yes, I mean with money! I should charge them! Haha!