Hey ejl, I looked at your other posts. Am I correct in assuming that we are talking the same plants here? If yes, then you got a lot of advice and not a lot of good advice at that. Telling you to water every 3 days in hydro is more in line with soil, certainly not with hydro.
If you are planing on saving these you should start by looking at the Hydro grow guide!!!
Get them away from the 600 hps (either raise to around 36" or preferably cfl's until (if) they recover)
Next, flush the nutes out (24 to 48 hours ph5.8, don't worry there are more then enough nutes in your medium for now)
Next, let us know your grow specs in detail (you can find info on that in the grow faqs)
From your posts it seems like these clones were already in flower when they were taken, are the clones sexually mature? (Are there fully developed pistils?) If they are then it is completely normal for them to take several weeks to revert back to veg, before you would see new growth.
You may be fighting a loosing battle here, with everything that has gone wrong so far! It would probably be a good idea to start some new clones or seeds at this point, just so you won't loose so much time if your current clones do not pull through.
Good luck mate,
Unity