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Thanks thincat - I will reuse them. The light is on a permanent moonlight and 8 hours daylight per day. I did wonder what the phosphates were like but as yet haven't noticed much hair algae and that has been my sign in the past of high phosphates. Maybe it is also controlled by cuc, the last tank was a tropical one and I was using tap water. The problem I've got is getting the clown goby to eat - I would ordinarily be feeding less often and less in terms of the amount but he seems so thin. We are going away and I'm leaving him to be looked after by someone who doesn't have experience of fishkeeping so I will have to cut the feeding back then to prevent the person overdoing it. He may not survive that but I'm weighing up how much I can trust the person to feed just the right quantity with risking params by allowing her to feed a lot. The fact that my ammonia, nitrites and nitrates are all at 0 must mean that the food is not endangering those main params but I guess it could be causing algae. I feel like I'm caught between a rock and a hard place to be honest!
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