Thanks for the quick reply. The fish I currently have in there are two dwarf puffers. I realise these are agressive fish, but my two seem to be concerned only with each other. They are both male so they won't breed and get over agressive on potential predators, and anyway I think they'll be okay with fish as in their old tank I had Amano shrimp who they never even looked at (some DP's will eat shrimp). My plan was to add one or two and watch carefully for agression, at the first sign of which I'd get the Khulis out. Is this idea unworkable?
Also do Khulis eat shrimp? I had planned to put them in my other tank with shrimp, so obviously if they do it's bad news.
All the best from Bill.
hummmm.....thats a hard one, it wont over stock the tank adding a few kuhliis, but the aggression could be a problem as you say. i have one very aggressive dwarf puffer who will attack anything, but saying that, i have 3 DP's in a 15gallon along with apple snails, ottos and a ghost shrimp, so i can understand how they can be pieceful sometimes. only once in a while will i see small fights between them, but it lasts a few moments and everythings back to normal, with no fish or anyother live animal hurt. im not sure, but sometimes males can be aggressive with each other as they compeat for domiance, as there is no females, maybe this isnt an issue. my 3 pieceful puffers are females i think, and the aggressive one male. i would add plenty of caves, rocks, plants, anything kuhliis can hide in and break the line of sight of the puffer will help. i would add 2 kuhliis to start with, and see how it goes, then in a few months or so, and everything is still good, maybe add another 2. as long as you watch as long as possable, as often as possable, if nessary from a distance, and watch for any aggression from the puffers i think it would be ok to add 2 kuhliis. ANY aggression, even a small nip, and the kuhliis should be out of there, they wont be able to stand the bulling from the dwarf puffers for long, so have a spare tank or something incase.
my kuhliis dont eat shrimps, amanos, ghost and crystal shrimps have all been fine with them, they may eat the young shrimplets if any, but wont touch the adults. as amanos wont breed in captivity very easily. i cant see a problem. sand is needed for the kuhliis though. if you have any more questions, just ask away.
good luck