I've been reading about tap water parameters in my area out of curiousity and it turns out that 4 years ago it was infested with Cryptosporidium protozoan. Not sure how it affects fish, but imagine this would have gone into my tank
Lol! The common plec will certainly provide enough ammonia to keep the filter going. Lol. I have never had much look with guppies.
In theory it should be able to handle all the 15 guppies or the plec and a few guppies. If you're going to be around to monitor the levels I'd put a fairly heavy load in straight away, that is the point of fishless cycling after all.
I think I'll take your advice guys and probably start with a few of the uglier male guppies and the pleco in a few days.
Sorry for asking again, but when is it ok to turn the UV light back on? Should I run it for a while before adding fish to kill any nasty stuff or is there a chance it will kill by bacteria pets? I've never used one before so I have no idea how this works.
I do have 3 young guppies that are doing very well atm though.