Well, I won't say anything about it... no wait... I will...
Well, .... I'm not an expert here, and I'm not going to fuss at you too much :lipssealedsmilie:, but I have learned that it is very important to have a big einough tank for you critters.... having said that... if you can't get a big tank right now then you really need to keep it ulta pure.
I read, I'm not sure if it was here on AC or during some of my other research, that for fish in a tank that is too small, it is more than just the fact that the fish are still small right now, that you need to consider.
They put out some kind of chemical or pheremone, or something like that, in response to their tank size and number of other fish in there with them, that their bodies recognise as a message that they are in tight quarters, so to speak, some kind of biochemical feedback, as it were, and this starts to work on their development pretty quick.
I may have read this in one of the threads in the Temperate and Coldwater Forum, where the goldfish experts have been advising others about the size requirements of goldfish, or in one of the other many articles I've read while doing research.
Nevertheless, if you can't get them a bigger home right now, I think if you do your utmost to do water changes every day, or overfilter, or both, even when the params look good, maybe the biochemical messengers won't have a negative impact on your fish. I'm afraid that 5 months is a pretty long time.
Another option is to get one of those huge sterilite containers at Wallyworld and make a temporary home for you loaches. Of course you'd have to have good fltration and heat just like you would with a big tank anyway.
You may not have room in your present living quarters for that, but I thought I'd mention it.
I'm glad your froggies are doing well. Mine are so fat they look like little Sumo wrestlers without the funny looking britches. :grinyes: