I think the slower growth rate is absolutely normal Par. I have NO idea why mine are growing like this! I am semi-retired and work from home when I do take on clients, so I have a distinct advantage in being able to monitor my tank all day long. My fish also eat nearly continuously during the day. I feed smaller amounts and just feed them about 6 times a day with a bedtime snack. I stop feeding when I see their tummies starting to round out.
So I have no clue why mine are shooting up the way they are. I don't think it's my Idaho water. The stuff has high pH. Though I think the GH and KH are actually low. I ordered the test kits and did the tests and don't know if I did them incorrectly or just am clueless on how to read the resutls. LOL
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So here is my disclaimer. I completely agree with Warlock that trying to raise juvies in a planted tank is a daunting task and that it's not something to tackle simply because you want to prove the good folks here wrong.
I had it easy, I started out with 4" fish from Hans! I would NEVER try this with anything less than 4"....can't even imagine trying it. I've also had to make a LOT of adjustments along the way as I found what worked and what was detrimental to the fish.
For instance, the EI method is NOT ever gonna work. I ended up putting my fish in buckets, tearing down my tank and replacing the substrate. I learned that you can't count on the plants for filtration at all. The plants ARE gonna suffer throught out the grow out period because you still have to do twice daily WC if you are feeding protein rich foods.
And on and on. Everyone is going to have a different experience, whether it be in a BB tank or a planted tank. And it's why I tell people who are determined to try it the planted way to be willing to do the WC's, feed well and make changes if and when things don't work.
Oh and I only answered Warlock's call for pics cuz I love teasing him. Not because I'm advocating growing out itty bitty discus in a planted tank.