what kind of substrate are you using?
i guess i should have mentioned some of my tank specs..:
*for the 125:
i used two #40 bags of flora max as the bottom layer
10-12? bags of eco
mourish of potash and dolomites at the very bottom
is working pretty well
i keep too many large plants that creat quite some shade but growth is steady
the lights on both tanks are from catalina, they are T5HO, it has 6 bulbs but i only use two from 6:30 to 9:00 and two come on for 2 hours around 12:30.
i don't fertilize too much, only occasional iron
fish in this tank includes: clown plecos, bushy nose plecos, rhino-marble sailfin pleco, boesmani rainbows, unidentified rainbows, madagascar rainbows, DD black angelfish, strawberry apistos, blue/green goodeids, montezuma swordtails, banjo catfishes, and bumblebee kittys...tylomania snails, coris, i think thats it
plants in this tank include: anubia nana, anubia coffefolia, anubia barterii, anubia lanceolata, crypt moehlmani, crypt cordata, crypt cordata var. , crypt nurii, crypt wendtii green, crypt wendtii red, crypt balansae var. , crypt unknowns sps.., trident java, narrow leaf java, windelov java, staurogyne sp. bihar, blixa aubertii, echinodorus aflame, e. sp. jaguar, melon sword, stargrass, aponogeton sp., hygrophila pinnatifida, Vallisneria sp., red root floaters and giant duckweed (probably more im forgetting now..)