Thanks for your replies guys.
Malawiman85 - - Agree the red devil can be aggressive, but so far mine appears to be good natured, I haven't noticed any aggression (yet). He is not skinny. I do my best to siphon all the muck from the substrate and dead spots each week. I could try and increase water changes to 50% as suggested. You mention worming can you recommend a good product ?
Westie - I've heard of skipping a daily feed. Might just try that.
Humbug - Yes I am using API and shaking bottle #2 as required. Might try LFS but must admit I haven't heard of this one before. Is this available from our local fish shop ?
Thanks again everyone. Rob