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
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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.